Merge pull request 'feat(offer): live catalog price list in the public offer (render sidecar)' (#244) from feature/offer-pricing-live into development

.gitea/workflows/ci.yaml

@@ -510,15 +510,20 @@ jobs:
       - name: Probe the /offer/ public offer page is served
         run: |
           set -u
-          # /offer/ is a static page baked into the landing image (rendered from
-          # ui/legal/offer_ru.md). If the landing Caddyfile stops routing it, the request
-          # silently falls through to the landing shell (also 200) — so assert offer-specific
-          # content, never just the status.
+          # /offer/ is rendered by the render sidecar: it splices the live catalog price list
+          # (fetched from the backend's internal endpoint) into the committed ui/legal/offer_ru.md.
+          # If the @offer caddy route is missing, the request falls to the landing shell (also 200),
+          # and if the backend fetch fails the sidecar returns 502 — so assert offer-specific content
+          # (the seller INN, §11) AND that the pricing marker was substituted (proves the fetch +
+          # splice ran), never just the status. Data-independent: an empty catalog still substitutes
+          # the marker with nothing, so "pricing_template" must be absent either way.
           out="$(docker run --rm --network edge alpine:3.20 wget -q -O - http://scrabble/offer/ 2>&1 || true)"
-          if echo "$out" | grep -q "290210610742"; then
-            echo "ok: /offer/ serves the public offer page"
+          if echo "$out" | grep -q "290210610742" && ! echo "$out" | grep -q "pricing_template"; then
+            echo "ok: /offer/ serves the rendered offer with the price list spliced in"
           else
-            echo "FAIL: /offer/ did not serve the offer page (fell through to the landing shell?)"
+            echo "FAIL: /offer/ did not serve the rendered offer (route fell through, or the price splice failed)"
+            docker logs --tail 50 scrabble-renderer || true
+            docker logs --tail 50 scrabble-backend || true
             docker logs --tail 50 scrabble-landing || true
             exit 1
           fi

backend/cmd/backend/main.go

@@ -283,6 +283,13 @@ func run(ctx context.Context, cfg config.Config, logger *zap.Logger) error {
 	}
 	logger.Info("payments domain ready")
 
+	// Warm the public-offer price list cache so /offer/ serves the current catalog from the first
+	// request; it is reprojected lazily thereafter on any catalog edit. Non-fatal — a transient
+	// failure here only defers the projection to the first read.
+	if _, err := paymentsSvc.OfferPricing(ctx); err != nil {
+		logger.Warn("offer pricing warm failed; will project on first request", zap.Error(err))
+	}
+
 	// Wire the payments surface into the domains that consume it: the online-game hint wallet
 	// and the account-merge wallet fold. Done after the reachability check so a broken payments
 	// schema fails boot before anything depends on it.

backend/internal/inttest/payments_catalog_test.go

@@ -4,6 +4,7 @@ package inttest
 
 import (
 	"context"
+	"strings"
 	"testing"
 
 	"github.com/google/uuid"
@@ -111,3 +112,44 @@ func TestPaymentsCatalogExcludesDeactivated(t *testing.T) {
 		t.Error("deactivated product must not appear in the storefront")
 	}
 }
+
+// TestOfferPricingReflectsCatalogEdits verifies the public-offer price list (§4.4) is projected from
+// the live catalog and its cache is invalidated on a catalog mutation: a newly created pack appears
+// with its per-rail prices, and archiving it through the service drops it from the next read.
+func TestOfferPricingReflectsCatalogEdits(t *testing.T) {
+	svc := newPaymentsService()
+	ctx := context.Background()
+	title := "OfferTest " + uuid.NewString()
+	id, err := svc.CreateProduct(ctx, payments.ProductInput{
+		Title: title,
+		Atoms: []payments.AtomLine{{Atom: "chips", Quantity: 50}},
+		Prices: []payments.PriceLine{
+			{Method: "direct", Currency: payments.CurrencyRUB, Amount: 20000},
+			{Method: "vk", Currency: payments.CurrencyVote, Amount: 30},
+			{Method: "telegram", Currency: payments.CurrencyStar, Amount: 100},
+		},
+	}, true)
+	if err != nil {
+		t.Fatalf("create pack: %v", err)
+	}
+
+	md, err := svc.OfferPricing(ctx)
+	if err != nil {
+		t.Fatalf("offer pricing: %v", err)
+	}
+	if row := "| " + title + " | 200.00 | 30 | 100 |"; !strings.Contains(md, row) {
+		t.Fatalf("offer pricing missing the new pack row %q\n%s", row, md)
+	}
+
+	// Archiving through the service marks the cache stale; the next read must reproject without it.
+	if err := svc.SetProductActive(ctx, id, false); err != nil {
+		t.Fatalf("archive: %v", err)
+	}
+	md, err = svc.OfferPricing(ctx)
+	if err != nil {
+		t.Fatalf("offer pricing after archive: %v", err)
+	}
+	if strings.Contains(md, title) {
+		t.Errorf("archived pack must drop from the offer pricing:\n%s", md)
+	}
+}

backend/internal/payments/catalog_admin.go

@@ -153,7 +153,11 @@ func (s *Service) CreateProduct(ctx context.Context, in ProductInput, active boo
 	if err := validateProduct(in, active); err != nil {
 		return uuid.Nil, err
 	}
-	return s.store.createProduct(ctx, in, active, s.clock())
+	id, err := s.store.createProduct(ctx, in, active, s.clock())
+	if err == nil {
+		s.markOfferStale()
+	}
+	return id, err
 }
 
 // UpdateProduct validates and replaces a product's title, atoms and prices. An active product must
@@ -166,7 +170,11 @@ func (s *Service) UpdateProduct(ctx context.Context, id uuid.UUID, in ProductInp
 	if err := validateProduct(in, active); err != nil {
 		return err
 	}
-	return s.store.updateProduct(ctx, id, in, s.clock())
+	if err := s.store.updateProduct(ctx, id, in, s.clock()); err != nil {
+		return err
+	}
+	s.markOfferStale()
+	return nil
 }
 
 // SetProductActive archives (active=false) or unarchives a product. Unarchiving revalidates the
@@ -181,11 +189,19 @@ func (s *Service) SetProductActive(ctx context.Context, id uuid.UUID, active boo
 			return err
 		}
 	}
-	return s.store.setProductActive(ctx, id, active, s.clock())
+	if err := s.store.setProductActive(ctx, id, active, s.clock()); err != nil {
+		return err
+	}
+	s.markOfferStale()
+	return nil
 }
 
 // DeleteProduct hard-deletes a product only when it has never been transacted (no order or ledger
 // row references it); otherwise it returns ErrProductTransacted and the caller archives instead.
 func (s *Service) DeleteProduct(ctx context.Context, id uuid.UUID) error {
-	return s.store.deleteProduct(ctx, id)
+	if err := s.store.deleteProduct(ctx, id); err != nil {
+		return err
+	}
+	s.markOfferStale()
+	return nil
 }

backend/internal/payments/offer.go

@@ -0,0 +1,212 @@
+package payments
+
+import (
+	"cmp"
+	"context"
+	"fmt"
+	"math"
+	"slices"
+	"strings"
+)
+
+// pricingMarker is the token the owner-edited offer markdown (ui/legal/offer_ru.md, §4.4) carries
+// where the price list belongs. The render sidecar replaces it with the markdown [Service.OfferPricing]
+// returns before rendering the /offer/ page; the backend only produces the tables, never the marker.
+const pricingMarker = "<#pricing_template#>"
+
+// OfferPricing returns the public-offer price list (§4.4) as two markdown tables projected from the
+// active catalog: first the chip packs (funding chips with money, priced per rail — roubles / VK
+// votes / Telegram Stars), then the chip-priced values (what a player exchanges chips for). The
+// result is cached in memory and reprojected only after a catalog mutation (see [Service.markOfferStale]),
+// so a steady-state read issues no query — only the first read after an edit reprojects. The render
+// sidecar fetches it and splices it into the offer markdown at the pricing marker.
+func (s *Service) OfferPricing(ctx context.Context) (string, error) {
+	s.offerMu.Lock()
+	defer s.offerMu.Unlock()
+	if s.offerFresh {
+		return s.offerMD, nil
+	}
+	md, err := s.buildOfferPricing(ctx)
+	if err != nil {
+		return "", err
+	}
+	s.offerMD = md
+	s.offerFresh = true
+	return md, nil
+}
+
+// markOfferStale marks the cached offer price list for reprojection on the next [Service.OfferPricing]
+// read. Every catalog mutation calls it; it takes no I/O, so it never fails the mutation that triggers it.
+func (s *Service) markOfferStale() {
+	s.offerMu.Lock()
+	s.offerFresh = false
+	s.offerMu.Unlock()
+}
+
+// buildOfferPricing loads the active catalog and projects it into the offer tables.
+func (s *Service) buildOfferPricing(ctx context.Context) (string, error) {
+	entries, err := s.store.loadCatalog(ctx)
+	if err != nil {
+		return "", err
+	}
+	return projectOfferPricing(entries), nil
+}
+
+// projectOfferPricing renders the active catalog into the two offer tables. A chip pack (it carries
+// the chips atom) lists its per-rail money price; a value (no chips atom) lists its uniform chip
+// price. Packs are ordered by ascending rouble price; values are grouped by what they grant (hints
+// only, then no-ads only, then no-ads + hints, then tournament — see [offerValueGroup]) and, within
+// each group, ordered by ascending chip price. Price columns are right-aligned. An empty section is
+// omitted. Amounts are rendered through [Money] so no floating point ever reaches the page (roubles
+// show kopecks as "200.00", whole-unit rails as integers); a missing rail price shows an em dash.
+func projectOfferPricing(entries []catalogEntry) string {
+	var packs, values []catalogEntry
+	for _, e := range entries {
+		if isPackEntry(e) {
+			packs = append(packs, e)
+		} else {
+			values = append(values, e)
+		}
+	}
+
+	// Packs: ascending by the rouble price (the offer's base currency); a pack with no rouble price
+	// sorts last. Values: by group, then ascending chip price. Stable, so the catalog order breaks ties.
+	slices.SortStableFunc(packs, func(a, b catalogEntry) int {
+		return cmp.Compare(offerSortAmount(a, string(SourceDirect), CurrencyRUB), offerSortAmount(b, string(SourceDirect), CurrencyRUB))
+	})
+	slices.SortStableFunc(values, func(a, b catalogEntry) int {
+		if d := cmp.Compare(offerValueGroup(a), offerValueGroup(b)); d != 0 {
+			return d
+		}
+		return cmp.Compare(offerSortAmount(a, "", CurrencyChip), offerSortAmount(b, "", CurrencyChip))
+	})
+
+	var b strings.Builder
+	if len(packs) > 0 {
+		b.WriteString("Приобретение внутриигровой валюты «Фишка»:\n\n")
+		b.WriteString("| Наименование | Рубли | Голоса в VK | Stars в Telegram |\n")
+		b.WriteString("| --- | ---: | ---: | ---: |\n")
+		for _, e := range packs {
+			fmt.Fprintf(&b, "| %s | %s | %s | %s |\n",
+				offerCell(e.title),
+				offerPrice(e, string(SourceDirect), CurrencyRUB),
+				offerPrice(e, string(SourceVK), CurrencyVote),
+				offerPrice(e, string(SourceTelegram), CurrencyStar),
+			)
+		}
+	}
+	if len(values) > 0 {
+		if len(packs) > 0 {
+			b.WriteString("\n")
+		}
+		b.WriteString("Использование внутриигровой валюты «Фишка»:\n\n")
+		b.WriteString("| Наименование | «Фишки» |\n")
+		b.WriteString("| --- | ---: |\n")
+		for _, e := range values {
+			fmt.Fprintf(&b, "| %s | %s |\n", offerCell(e.title), offerPrice(e, "", CurrencyChip))
+		}
+	}
+	return strings.TrimRight(b.String(), "\n")
+}
+
+// offerValueGroup ranks a chip-priced value into the offer's usage groups, in listing order: hints
+// only (0), no-ads only (1), no-ads + hints (2), then anything carrying the tournament atom (3).
+// Tournament products are not sellable yet (validateProduct forbids an active one), so group 3 is
+// empty today; the rank reserves their place for when the tournament economy lands. A value with no
+// recognised benefit atom sorts after the known groups (defensive — the catalog shape forbids it).
+func offerValueGroup(e catalogEntry) int {
+	hasHints, hasNoAds, hasTournament := false, false, false
+	for _, a := range e.atoms {
+		switch a.atomType {
+		case "hints":
+			hasHints = true
+		case "noads_days":
+			hasNoAds = true
+		case "tournament":
+			hasTournament = true
+		}
+	}
+	switch {
+	case hasTournament:
+		return 3
+	case hasHints && hasNoAds:
+		return 2
+	case hasNoAds:
+		return 1
+	case hasHints:
+		return 0
+	default:
+		return 4
+	}
+}
+
+// offerSortAmount returns the entry's price in the given method and currency for ordering, or
+// math.MaxInt64 when it carries no such price, so a misconfigured row sorts last rather than leading.
+func offerSortAmount(e catalogEntry, method string, cur Currency) int64 {
+	if amt, ok := offerAmount(e, method, cur); ok {
+		return amt
+	}
+	return math.MaxInt64
+}
+
+// isPackEntry reports whether the catalog entry is a chip pack — it carries the chips atom (funds
+// chips with money) rather than being a chip-priced value.
+func isPackEntry(e catalogEntry) bool {
+	for _, a := range e.atoms {
+		if a.atomType == atomChips {
+			return true
+		}
+	}
+	return false
+}
+
+// offerPrice formats the entry's price for the given payment method and currency as a major-unit
+// string, or an em dash when the entry carries no such price.
+func offerPrice(e catalogEntry, method string, cur Currency) string {
+	amt, ok := offerAmount(e, method, cur)
+	if !ok {
+		return "—"
+	}
+	m, err := MoneyFromMinor(amt, cur)
+	if err != nil {
+		return "—"
+	}
+	return m.Major()
+}
+
+// offerAmount returns the raw minor-unit amount of the entry's price for the payment method and
+// currency, and whether such a price exists.
+func offerAmount(e catalogEntry, method string, cur Currency) (int64, bool) {
+	for _, pr := range e.prices {
+		if pr.method == method && pr.currency == cur {
+			return pr.amount, true
+		}
+	}
+	return 0, false
+}
+
+// offerCellReplacer neutralises every metacharacter of an admin-entered title so it renders as
+// literal text in the public offer. The title is operator input (the /_gm catalog editor) that flows
+// into a markdown table cell and then through marked into the /offer/ HTML, which is deliberately not
+// sanitised — so escaping here is the trust boundary. It covers HTML (no tag or entity reaches the
+// page), the markdown table pipe and the row newline, and the link brackets (a title must never
+// become a "javascript:" link). marked passes the entities through unchanged, so the reader sees the
+// exact title. NewReplacer scans once and never re-scans its own output, so "&" → "&amp;" does not
+// double-escape the entities the other rules emit.
+var offerCellReplacer = strings.NewReplacer(
+	"&", "&amp;",
+	"<", "&lt;",
+	">", "&gt;",
+	`"`, "&quot;",
+	"'", "&#39;",
+	"|", `\|`,
+	"[", `\[`,
+	"]", `\]`,
+	"\n", " ",
+)
+
+// offerCell escapes an admin-entered title for safe, literal rendering in a markdown table cell of
+// the public offer (see [offerCellReplacer]).
+func offerCell(s string) string {
+	return offerCellReplacer.Replace(s)
+}

backend/internal/payments/offer_test.go

@@ -0,0 +1,137 @@
+package payments
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/google/uuid"
+)
+
+// TestProjectOfferPricing checks the happy path: a chip pack priced on every rail and a chip-priced
+// value render into the two tables, pack table first, money formatted through Money.
+func TestProjectOfferPricing(t *testing.T) {
+	entries := []catalogEntry{
+		{
+			id:    uuid.New(),
+			title: "50 «Фишек»",
+			atoms: []atomQty{{atomType: atomChips, quantity: 50}},
+			prices: []priceRow{
+				{method: string(SourceDirect), currency: CurrencyRUB, amount: 20000},
+				{method: string(SourceVK), currency: CurrencyVote, amount: 30},
+				{method: string(SourceTelegram), currency: CurrencyStar, amount: 100},
+			},
+		},
+		{
+			id:     uuid.New(),
+			title:  "200 подсказок",
+			atoms:  []atomQty{{atomType: "hints", quantity: 200}},
+			prices: []priceRow{{method: "", currency: CurrencyChip, amount: 50}},
+		},
+	}
+	md := projectOfferPricing(entries)
+	for _, want := range []string{
+		"| Наименование | Рубли | Голоса в VK | Stars в Telegram |",
+		"| --- | ---: | ---: | ---: |", // price columns right-aligned
+		"| 50 «Фишек» | 200.00 | 30 | 100 |",
+		"| Наименование | «Фишки» |",
+		"| --- | ---: |",
+		"| 200 подсказок | 50 |",
+	} {
+		if !strings.Contains(md, want) {
+			t.Errorf("projection missing %q\n---\n%s", want, md)
+		}
+	}
+	if strings.Index(md, "Приобретение") > strings.Index(md, "Использование") {
+		t.Errorf("the pack table must precede the values table:\n%s", md)
+	}
+}
+
+// TestProjectOfferPricingOrdering checks packs sort by ascending rouble price, and values sort by
+// group (hints only → no-ads only → no-ads + hints) then ascending chip price within a group.
+func TestProjectOfferPricingOrdering(t *testing.T) {
+	pack := func(title string, rub int64) catalogEntry {
+		return catalogEntry{
+			id:     uuid.New(),
+			title:  title,
+			atoms:  []atomQty{{atomType: atomChips, quantity: 1}},
+			prices: []priceRow{{method: string(SourceDirect), currency: CurrencyRUB, amount: rub}},
+		}
+	}
+	value := func(title string, chips int64, atoms ...string) catalogEntry {
+		e := catalogEntry{id: uuid.New(), title: title, prices: []priceRow{{method: "", currency: CurrencyChip, amount: chips}}}
+		for _, a := range atoms {
+			e.atoms = append(e.atoms, atomQty{atomType: a, quantity: 1})
+		}
+		return e
+	}
+	// Deliberately out of order on input.
+	entries := []catalogEntry{
+		pack("packDear", 30000),
+		pack("packCheap", 10000),
+		value("bundle", 500, "hints", "noads_days"),
+		value("adsOnly", 150, "noads_days"),
+		value("hintsBig", 200, "hints"),
+		value("hintsSmall", 50, "hints"),
+	}
+	md := projectOfferPricing(entries)
+	order := []string{"packCheap", "packDear", "hintsSmall", "hintsBig", "adsOnly", "bundle"}
+	last := -1
+	for _, title := range order {
+		i := strings.Index(md, "| "+title+" |")
+		if i < 0 {
+			t.Fatalf("row %q missing:\n%s", title, md)
+		}
+		if i < last {
+			t.Errorf("row %q out of order (want sequence %v):\n%s", title, order, md)
+		}
+		last = i
+	}
+}
+
+// TestProjectOfferPricingMissingRailAndEscaping checks a pack missing a rail shows an em dash and a
+// title carrying a pipe is escaped so the table layout survives.
+func TestProjectOfferPricingMissingRailAndEscaping(t *testing.T) {
+	entries := []catalogEntry{{
+		id:    uuid.New(),
+		title: "Bonus | pack",
+		atoms: []atomQty{{atomType: atomChips, quantity: 10}},
+		// A roubles price only — no VK, no Telegram.
+		prices: []priceRow{{method: string(SourceDirect), currency: CurrencyRUB, amount: 9900}},
+	}}
+	md := projectOfferPricing(entries)
+	if want := `| Bonus \| pack | 99.00 | — | — |`; !strings.Contains(md, want) {
+		t.Errorf("want row %q in:\n%s", want, md)
+	}
+}
+
+// TestProjectOfferPricingEscapesHTMLAndLinks checks an admin title carrying HTML or a markdown link
+// is neutralised so it cannot inject markup into the public offer: the tag becomes entities and the
+// link brackets are escaped (so no "javascript:" anchor forms). The raw metacharacters must not
+// survive into the projected markdown.
+func TestProjectOfferPricingEscapesHTMLAndLinks(t *testing.T) {
+	entries := []catalogEntry{{
+		id:     uuid.New(),
+		title:  `<script>alert(1)</script> [x](javascript:alert(2)) & "q"`,
+		atoms:  []atomQty{{atomType: "hints", quantity: 1}},
+		prices: []priceRow{{method: "", currency: CurrencyChip, amount: 5}},
+	}}
+	md := projectOfferPricing(entries)
+	for _, bad := range []string{"<script>", "</script>", "[x]", `& "q"`} {
+		if strings.Contains(md, bad) {
+			t.Errorf("unescaped %q survived into the projection:\n%s", bad, md)
+		}
+	}
+	for _, want := range []string{"&lt;script&gt;", `\[x\]`, "&amp;", "&quot;q&quot;"} {
+		if !strings.Contains(md, want) {
+			t.Errorf("want escaped %q in:\n%s", want, md)
+		}
+	}
+}
+
+// TestProjectOfferPricingEmpty checks an empty catalog projects to the empty string (no stray table
+// headers), so the offer's pricing marker is replaced with nothing.
+func TestProjectOfferPricingEmpty(t *testing.T) {
+	if got := projectOfferPricing(nil); got != "" {
+		t.Errorf("empty catalog must project to empty string, got %q", got)
+	}
+}

backend/internal/payments/service.go

@@ -5,6 +5,7 @@ import (
 	"database/sql"
 	"encoding/json"
 	"fmt"
+	"sync"
 	"time"
 
 	"github.com/google/uuid"
@@ -19,6 +20,13 @@ import (
 type Service struct {
 	store *Store
 	clock func() time.Time
+
+	// offerMu guards the cached public-offer price list (§4.4). offerMD holds the projected
+	// markdown tables and offerFresh whether they are current; a catalog mutation clears offerFresh
+	// (markOfferStale) and the next OfferPricing read reprojects, so a served render issues no query.
+	offerMu    sync.Mutex
+	offerMD    string
+	offerFresh bool
 }
 
 // NewService constructs a Service over store with a wall-clock time source.

backend/internal/server/handlers.go

@@ -74,6 +74,9 @@ func (s *Server) registerRoutes() {
 		u.POST("/wallet/buy", s.handleWalletBuy)
 		// A rewarded-video credit (VK ads): client-attested + a config daily cap.
 		u.POST("/wallet/reward", s.handleWalletReward)
+		// The public-offer price list (§4.4) as markdown, for the render sidecar that serves the
+		// /offer/ page. Internal (off the edge allow-list); called by the renderer, not the gateway.
+		s.internal.GET("/offer/pricing", s.handleOfferPricing)
 	}
 	if s.payments != nil {
 		// The money order endpoint dispatches by rail (direct → Robokassa, vk → VK); an

backend/internal/server/handlers_wallet.go

@@ -112,6 +112,22 @@ func (s *Server) handleWalletCatalog(c *gin.Context) {
 	c.JSON(http.StatusOK, catalogDTOFrom(view))
 }
 
+// handleOfferPricing serves the public-offer price list (§4.4) as markdown — the two catalog tables
+// projected from the active products. The render sidecar fetches it and splices it into the offer
+// markdown before rendering the /offer/ page. Internal, non-public: the /api/v1/internal group is
+// off the edge allow-list, and the value is served from the payments cache (no per-request query in
+// the steady state). Called by the renderer, not the gateway.
+func (s *Server) handleOfferPricing(c *gin.Context) {
+	md, err := s.payments.OfferPricing(c.Request.Context())
+	if err != nil {
+		s.log.Error("offer pricing projection failed", zap.Error(err))
+		c.String(http.StatusInternalServerError, "offer pricing unavailable")
+		return
+	}
+	c.Header("Content-Type", "text/markdown; charset=utf-8")
+	c.String(http.StatusOK, md)
+}
+
 // handleWallet returns the caller's wallet — the segments and benefits visible in the current
 // trusted execution context, plus the rewarded-video payout available here (0 outside VK or when
 // unconfigured), which gates the client's "watch for chips" button.

deploy/caddy/Caddyfile

@@ -107,6 +107,15 @@
 		}
 	}
 
+	# The public offer page is rendered by the render sidecar: it splices the live catalog price
+	# list (backend, internal) into the committed ui/legal/offer_ru.md and returns the HTML. Only
+	# /offer/ is exposed here — the sidecar's /render stays off this allow-list, internal-only. Kept
+	# disjoint from the landing/app paths so the catch-all below never shadows it.
+	@offer path /offer /offer/*
+	handle @offer {
+		reverse_proxy renderer:8090
+	}
+
 	# Everything else — the public landing at / and any stray path — is static.
 	handle {
 		reverse_proxy landing:80

deploy/docker-compose.yml

@@ -84,6 +84,9 @@ services:
     logging: *default-logging
     environment:
       RENDERER_PORT: "8090"
+      # The offer page (GET /offer/) fetches the live catalog price list from the backend's internal
+      # endpoint and splices it into the committed offer markdown. Backend down ⇒ /offer/ returns 502.
+      RENDERER_BACKEND_URL: http://backend:8080
     healthcheck:
       test: ["CMD", "node", "-e", "fetch('http://127.0.0.1:8090/healthz').then((r)=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))"]
       interval: 10s

deploy/landing/Caddyfile

@@ -18,18 +18,9 @@
 	@shell not path /assets/*
 	header @shell Cache-Control "no-cache"
 
-	# The static public offer page, rendered from ui/legal/offer_ru.md at build
-	# time into dist/offer/index.html (vite emit-offer plugin). Served with its own
-	# index so /offer/ resolves to /srv/offer/index.html rather than falling to the
-	# landing shell below (whose index is landing.html). A bare /offer redirects in.
-	handle /offer {
-		redir * /offer/ permanent
-	}
-	handle /offer/* {
-		file_server {
-			index index.html
-		}
-	}
+	# The public offer page (/offer/) is no longer served here: the contour caddy routes it to the
+	# render sidecar, which splices the live catalog price list into ui/legal/offer_ru.md. This
+	# container never sees /offer/, so it carries no offer assets (the vite emit-offer plugin is gone).
 
 	# An unknown path falls back to the landing shell (the gateway's old "/"
 	# behaviour); "/" itself resolves through the index below.

docs/ARCHITECTURE.md

@@ -909,6 +909,22 @@ finished journal on each GET. The only degraded platform is a legacy Telegram cl
 predating `downloadFile`, where the GCG falls back to the old clipboard copy and the
 image option is not offered.
 
+The same sidecar also serves the **public offer page** at `/offer/` — the one edge-exposed
+route on it (caddy routes `/offer/` here; its `/render` stays internal). It reuses the shared
+`ui/src/lib/offer.ts` renderer (again one renderer, no drift) over the owner-edited
+`ui/legal/offer_ru.md`, baked into the image, splicing in the **live price list** (§4.4): it
+fetches the two catalog tables as markdown from the backend's internal
+`/api/v1/internal/offer/pricing` at the `<#pricing_template#>` marker, then renders the page. The
+backend projects the tables from the active catalog through `payments.Money` (no float reaches the
+page) and caches them in memory — built at boot, reprojected on any catalog edit — so a served
+render issues no query in the steady state and the page always reflects the current catalog without
+a redeploy. A backend outage degrades `/offer/` to a 502 rather than a stale price list. Packs are
+ordered by ascending rouble price; values are grouped by what they grant — hints only, then no-ads
+only, then no-ads + hints, then (reserved, empty today) products carrying the **tournament** atom,
+which becomes a fourth group once the tournament economy makes them sellable — and ordered by
+ascending chip price within each group. Product titles are admin input, so the projection escapes
+them (HTML entities + markdown metacharacters) before they reach the un-sanitised renderer.
+
 The alphabet-on-the-wire transport does **not** touch this invariant: the live edge
 exchanges alphabet indices, but the persisted journal (and everything derived from it —
 replay, history, GCG) keeps the decoded concrete letters described above, so an archived
@@ -1349,9 +1365,10 @@ in-process (the distroless image has no `/etc/mime.types`). Hash-named `/assets/
 in-compose **caddy** is the contour's edge: it owns a single `/_gm` Basic-Auth and
 routes `/_gm/grafana/*` to **Grafana** (anonymous-admin, so the one shared login gates
 it with no per-user Grafana accounts) and the rest of `/_gm/*` to the backend-rendered
-**admin console**; `/app/`, `/telegram/`, `/vk/` and the Connect path go to the gateway; the
-catch-all — notably the landing at `/`, plus the static public offer at `/offer/`
-(rendered from `ui/legal/offer_ru.md` at build time) — goes to the landing container. The
+**admin console**; `/app/`, `/telegram/`, `/vk/` and the Connect path go to the gateway; `/offer/`
+(the public offer, rendered by the `renderer` sidecar with the live catalog price list spliced in)
+goes to the render sidecar; and the catch-all — notably the landing at `/` — goes to the landing
+container. The
 **Telegram validator** runs as a separate container with **no public ingress**,
 answering only internal gRPC (HMAC, no Telegram egress). The **Telegram bot** holds
 no inbound port either: it dials the gateway's **bot-link** (mTLS) and egresses to

docs/FUNCTIONAL.md

@@ -30,7 +30,11 @@ render with arbitrary languages, so detection would make the indexed content
 nondeterministic); a saved 🌐 choice still wins. The page carries a static Russian SEO head
 (title/description, the Open Graph card Telegram/VK link previews use, a canonical link
 pinned to the production origin, JSON-LD, the favicon set and `robots.txt`), while the SPA
-shell is `noindex` — the landing is the only indexable page.
+shell is `noindex` — the landing is the only indexable page. The footer links to the **public
+offer** (`/offer/`) and, beside it, **feedback** — the Telegram bot the offer names as the seller's
+contact. The offer page (the legal document a purchase accepts) is rendered on demand from
+`ui/legal/offer_ru.md` with its **price list** (§4.4) generated from the live product catalog, so
+the published prices always match what is currently on sale — no redeploy to update them.
 
 On the plain web the client is an **installable PWA**: a logged-out player sees an install
 call-to-action under the login form (and at the bottom of Settings) that installs the app to the

docs/FUNCTIONAL_ru.md

@@ -32,7 +32,12 @@ top-1 подсказку, безлимитную проверку слова с
 главнее. Страница несёт статическую русскую SEO-«шапку» (title/description, карточка
 Open Graph, которую используют превью ссылок в Telegram/VK, канонический адрес
 продакшен-домена, JSON-LD, набор favicon и `robots.txt`), а оболочка SPA помечена
-`noindex` — индексируется только посадочная страница.
+`noindex` — индексируется только посадочная страница. В подвале — ссылки на **публичную
+оферту** (`/offer/`) и рядом на **обратную связь** (тот самый Telegram-бот, который оферта
+указывает как контакт Продавца). Страница оферты (юридический документ, который принимается при
+покупке) рендерится по запросу из `ui/legal/offer_ru.md`, а её **перечень стоимости** (§4.4)
+формируется из живого каталога товаров, поэтому опубликованные цены всегда совпадают с тем, что
+сейчас в продаже — без передеплоя.
 
 В обычном вебе клиент — **устанавливаемое PWA**: незалогиненный игрок видит призыв к установке
 под формой входа (и внизу «Настроек»), который в один тап ставит приложение на рабочий стол

renderer/Dockerfile

@@ -23,7 +23,10 @@ ENV APP_VERSION=${VERSION}
 WORKDIR /app
 COPY --from=build /src/renderer/node_modules ./node_modules
 COPY --from=build /src/renderer/dist ./dist
-COPY renderer/src/server.mjs renderer/src/render.mjs ./src/
+COPY renderer/src/server.mjs renderer/src/render.mjs renderer/src/offer.mjs ./src/
+# The public-offer prose (GET /offer/): the owner-edited markdown, read once at boot. The dynamic
+# price list is fetched from the backend at request time and spliced in.
+COPY ui/legal/offer_ru.md ./legal/offer_ru.md
 USER node
 EXPOSE 8090
 CMD ["node", "src/server.mjs"]

renderer/README.md

@@ -1,10 +1,10 @@
-# renderer — the finished-game image-render sidecar
+# renderer — the render sidecar (finished-game image + public offer page)
 
-An internal-only Node service that rasterizes the finished-game export PNG. It runs the
-**same** `ui/src/lib/gameimage.ts` the web project unit-tests — bundled verbatim at image
-build time (`src/entry.ts` → esbuild → `dist/gameimage.mjs`) — on
-[skia-canvas](https://github.com/samizdatco/skia-canvas), so the server render is
-pixel-identical to the design the owner signed off in the browser.
+An internal Node service that runs shared `ui/src/lib` renderers server-side — bundled verbatim at
+image build time (`src/entry.ts` → esbuild → `dist/gameimage.mjs`) so there is one renderer and no
+drift from the browser. It serves two surfaces: the finished-game export **PNG** (on
+[skia-canvas](https://github.com/samizdatco/skia-canvas), pixel-identical to the design the owner
+signed off) and the public **offer page**.
 
 ## Interface
 
@@ -12,20 +12,30 @@ pixel-identical to the design the owner signed off in the browser.
   `image/png`. `game`/`moves` are the ui-model shapes (`GameView` / `MoveRecord[]`);
   `alphabet` is the per-variant `(index, letter, value)` table tile values are drawn
   from; `labels` localizes the non-play moves (pass/exchange/resign/timeout);
-  `hostname` + `dateLocale` feed the footer.
+  `hostname` + `dateLocale` feed the footer. Internal-only.
+- `GET /offer/` — the public offer page as `text/html`: the owner-edited `ui/legal/offer_ru.md`
+  (baked into the image, read at boot) with the live catalog **price list** (§4.4) fetched as
+  markdown from the backend's internal `/api/v1/internal/offer/pricing` (`RENDERER_BACKEND_URL`)
+  and spliced in at the `<#pricing_template#>` marker, then rendered by the shared
+  `ui/src/lib/offer.ts`. `GET /offer` → 301 `/offer/`. **The only edge-exposed route** — caddy
+  routes `/offer/` here; a backend outage yields a 502, never a stale price list.
 - `GET /healthz` — liveness (the compose healthcheck the backend's `depends_on` gates on).
 
-The service draws and nothing else: authentication, the participant check and the signed
-public download URL all live in the backend (`backend/internal/server/export.go`); the
-network path is client → gateway `/dl/*` → backend → this sidecar.
+The service renders and nothing else: for the PNG, authentication, the participant check and the
+signed public download URL all live in the backend (`backend/internal/server/export.go`), the path
+being client → gateway `/dl/*` → backend → this sidecar; for the offer, the catalog projection and
+its cache live in the backend (`backend/internal/payments/offer.go`) and no user input reaches the
+page.
 
 ## Development
 
 ```sh
 pnpm install          # skia-canvas + esbuild MUST stay approved in pnpm-workspace.yaml
                       # (allowBuilds) or the native binary is silently never fetched
-pnpm test             # bundles, then node --test against testdata/request.json
-node src/server.mjs   # local run on :8090 (RENDERER_PORT overrides)
+pnpm test             # bundles, then node --test (PNG smoke + offer splice)
+# local run on :8090 (RENDERER_PORT overrides). For /offer/, point at the offer source and a
+# reachable backend (else the boot read / the price fetch fail):
+RENDERER_OFFER_MD=../ui/legal/offer_ru.md RENDERER_BACKEND_URL=http://localhost:8080 node src/server.mjs
 ```
 
 The runtime image (`renderer/Dockerfile`, `node:22-slim`) bakes in Liberation Sans (the

renderer/build.mjs

@@ -9,5 +9,9 @@ await build({
   format: 'esm',
   platform: 'node',
   outfile: 'dist/gameimage.mjs',
+  // The shared ui/src/lib modules are copied without their node_modules, so a bare npm import they
+  // make (offer.ts → 'marked', the offer renderer's markdown parser) is not resolvable from the ui
+  // tree. NODE_PATH-style fallback to the renderer's own node_modules, where marked is a dependency.
+  nodePaths: ['node_modules'],
   logLevel: 'info',
 });

renderer/package.json

@@ -9,6 +9,7 @@
     "test": "pnpm run bundle && node --test test/*.test.mjs"
   },
   "dependencies": {
+    "marked": "^18.0.5",
     "skia-canvas": "^3.0.6"
   },
   "devDependencies": {

renderer/pnpm-lock.yaml

@@ -8,6 +8,9 @@ importers:
 
   .:
     dependencies:
+      marked:
+        specifier: ^18.0.5
+        version: 18.0.6
       skia-canvas:
         specifier: ^3.0.6
         version: 3.0.8
@@ -209,6 +212,11 @@ packages:
     resolution: {integrity: sha512-vK9P5/iUfdl95AI+JVyUuIcVtd4ofvtrOr3HNtM2yxC9bnMbEdp3x01OhQNnjb8IJYi38VlTE3mBXwcfvywuSw==}
     engines: {node: '>= 14'}
 
+  marked@18.0.6:
+    resolution: {integrity: sha512-MrV5puXBfuiy6wl6DLaq3BtIJQAJToAd5zt/ZKhRfGRAuFPALE7/4Y7jnxRQoEgK/pBgurGqLyAuRgZ2xOjr6w==}
+    engines: {node: '>= 20'}
+    hasBin: true
+
   ms@2.1.3:
     resolution: {integrity: sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==}
 
@@ -347,6 +355,8 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
+  marked@18.0.6: {}
+
   ms@2.1.3: {}
 
   parenthesis@3.1.8: {}

renderer/src/entry.ts

@@ -1,6 +1,9 @@
-// The esbuild bundle entry: re-exports the SHARED game-image renderer from ui/src/lib —
-// the exact module the browser build unit-tests — plus the alphabet cache seeder the
-// server fills from the backend-supplied per-variant table. Bundled by `pnpm run bundle`
-// into dist/gameimage.mjs (type erasure only; the ui project type-checks the source).
+// The esbuild bundle entry: re-exports the SHARED ui/src/lib modules — the exact modules the
+// browser build unit-tests — so the sidecar runs them on the server. Bundled by `pnpm run bundle`
+// into dist/gameimage.mjs (type erasure only; the ui project type-checks the source):
+//   - drawGameImage + setAlphabet: the finished-game PNG export (POST /render).
+//   - renderOfferHtml: the public-offer page (GET /offer/) — the same renderer the landing build
+//     used to invoke, now server-side so the live catalog price list can be spliced in.
 export { drawGameImage, type RenderOptions } from '../../ui/src/lib/gameimage';
 export { setAlphabet } from '../../ui/src/lib/alphabet';
+export { renderOfferHtml } from '../../ui/src/lib/offer';

renderer/src/offer.mjs

@@ -0,0 +1,17 @@
+// The public-offer page renderer: splices the live catalog price list into the owner-edited offer
+// markdown and renders it with the SAME renderOfferHtml the landing build used to invoke (bundled
+// from ui/src/lib/offer). Kept out of server.mjs so the substitution is unit-testable without HTTP.
+import { renderOfferHtml } from '../dist/gameimage.mjs';
+
+// pricingMarker is the token ui/legal/offer_ru.md carries at §4.4 where the price list belongs. It
+// mirrors the backend marker (backend/internal/payments/offer.go) and is replaced with the fetched
+// tables before rendering.
+export const pricingMarker = '<#pricing_template#>';
+
+// renderOffer returns the standalone /offer/ HTML: the offer markdown with the pricing marker
+// replaced by pricingTables (the two markdown tables the backend projects from the active catalog),
+// rendered to a self-contained document. The replacement is literal (a function replacer) so a "$"
+// in a product title is never read as a replacement pattern; a missing marker leaves the text as is.
+export function renderOffer(offerMarkdown, pricingTables) {
+  return renderOfferHtml(offerMarkdown.replace(pricingMarker, () => pricingTables));
+}

renderer/src/server.mjs

@@ -1,20 +1,43 @@
-// The render sidecar: a minimal internal HTTP service the backend calls to rasterize the
-// finished-game export image. It runs the same drawGameImage the browser build ships
-// (bundled from ui/src/lib at image build time) on skia-canvas, with system fonts from
-// the image (Liberation Sans + Noto Color Emoji via fontconfig).
+// The render sidecar: a minimal internal HTTP service on skia-canvas and the shared ui/src/lib
+// renderers (bundled from ui/src/lib at image build time). It serves two surfaces:
 //
 //   POST /render  {game, moves, alphabet, labels, dateLocale, hostname, scale?} → image/png
+//   GET  /offer/  → text/html  (the public offer page: ui/legal/offer_ru.md with the live catalog
+//                   price list spliced in — the only edge-exposed route; caddy routes /offer/ here)
+//   GET  /offer   → 301 /offer/
 //   GET  /healthz → 200
 //
-// The service is internal-only (docker network `internal`); authentication, participant
-// checks and the signed public URL all live in the backend — this process only draws.
+// /render is internal-only (the backend calls it; authentication, participant checks and the signed
+// public URL live in the backend). /offer/ is reachable from the edge but read-only and unprivileged
+// — it fetches the price list from the backend's internal endpoint and renders the committed offer
+// markdown; no user input reaches it.
 import { createServer } from 'node:http';
+import { readFileSync } from 'node:fs';
 import { renderRequest } from './render.mjs';
+import { renderOffer } from './offer.mjs';
 
 const PORT = Number(process.env.RENDERER_PORT || 8090);
 // A render request is a finished game's journal — generously capped.
 const MAX_BODY = 2 * 1024 * 1024;
 
+// The offer prose is baked into the image (renderer/Dockerfile) and read once at boot; only the
+// price list is dynamic (fetched per request). The backend endpoint is internal (off the edge
+// allow-list) and serves the tables from its in-memory cache. RENDERER_OFFER_MD overrides the baked
+// path for a local run (point it at ../ui/legal/offer_ru.md).
+const OFFER_MD = readFileSync(process.env.RENDERER_OFFER_MD || new URL('../legal/offer_ru.md', import.meta.url), 'utf8');
+const OFFER_PRICING_URL =
+  (process.env.RENDERER_BACKEND_URL || 'http://backend:8080') + '/api/v1/internal/offer/pricing';
+
+// fetchOfferPricing returns the two catalog price tables as markdown from the backend, or throws a
+// 502 (upstream error) / 504 (timeout) so the offer never renders with a broken price list.
+async function fetchOfferPricing() {
+  const resp = await fetch(OFFER_PRICING_URL, { signal: AbortSignal.timeout(5000) });
+  if (!resp.ok) {
+    throw Object.assign(new Error(`offer pricing upstream ${resp.status}`), { status: 502 });
+  }
+  return resp.text();
+}
+
 function readBody(req) {
   return new Promise((resolve, reject) => {
     const chunks = [];
@@ -35,11 +58,23 @@ function readBody(req) {
 
 const server = createServer(async (req, res) => {
   try {
-    if (req.method === 'GET' && req.url === '/healthz') {
+    const path = (req.url || '').split('?')[0];
+    if (req.method === 'GET' && path === '/healthz') {
       res.writeHead(200, { 'content-type': 'text/plain' }).end('ok');
       return;
     }
-    if (req.method === 'POST' && req.url === '/render') {
+    if (req.method === 'GET' && path === '/offer') {
+      res.writeHead(301, { location: '/offer/' }).end();
+      return;
+    }
+    if (req.method === 'GET' && path === '/offer/') {
+      const html = renderOffer(OFFER_MD, await fetchOfferPricing());
+      res
+        .writeHead(200, { 'content-type': 'text/html; charset=utf-8', 'cache-control': 'no-cache' })
+        .end(html);
+      return;
+    }
+    if (req.method === 'POST' && path === '/render') {
       const png = await renderRequest(JSON.parse(await readBody(req)));
       res.writeHead(200, { 'content-type': 'image/png', 'content-length': png.length }).end(png);
       return;

renderer/test/offer.test.mjs

@@ -0,0 +1,29 @@
+// Unit test for the public-offer page assembly: renderOffer splices the backend's price-list
+// markdown into the offer at the pricing marker and renders it with the shared renderOfferHtml
+// (bundled from ui/src/lib/offer). The prose rendering itself is unit-tested in ui/ (offer.test.ts);
+// here we assert the substitution and that the tables reach the rendered HTML.
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { renderOffer, pricingMarker } from '../src/offer.mjs';
+
+const tables =
+  '| Наименование | Рубли | Голоса в VK | Stars в Telegram |\n' +
+  '| --- | --- | --- | --- |\n' +
+  '| 50 «Фишек» | 200.00 | 30 | 100 |';
+
+test('splices the price list into the offer and renders the tables to HTML', () => {
+  const md = `# Публичная оферта\n\n**4.4.** Стоимость Товаров:\n\n${pricingMarker}\n`;
+  const html = renderOffer(md, tables);
+  // The marker is gone and the projected table reached the document as a real HTML table.
+  assert.ok(!html.includes(pricingMarker), 'pricing marker must be substituted');
+  assert.ok(html.includes('<table>'), 'the price list must render as an HTML table');
+  assert.ok(html.includes('<td>200.00</td>'), 'a rouble price cell must be present');
+  assert.ok(html.includes('50 «Фишек»'), 'the product title must be present');
+  // The offer chrome from the shared renderer is intact.
+  assert.ok(html.includes('<!doctype html>'));
+});
+
+test('a "$" in a title is substituted literally, not as a replacement pattern', () => {
+  const html = renderOffer(`x ${pricingMarker} y`, '| $5 pack | 1 |');
+  assert.ok(html.includes('$5 pack'), 'a "$" in the tables must survive substitution');
+});

ui/e2e/landing.spec.ts

@@ -59,13 +59,18 @@ test('the landing shows a web-version entry linking /app/, with a caption', asyn
   await expect(page.getByText('Веб-версия')).toBeVisible();
 });
 
-// The footer carries a public-offer link to the static /offer/ page (rendered from
-// ui/legal/offer_ru.md at build; the legal document a purchase accepts).
-test('the landing footer links to the public offer at /offer/', async ({ page }) => {
+// The footer carries the public-offer link (/offer/ — the legal document a purchase accepts,
+// rendered by the render sidecar) and, beside it, the feedback link to the Telegram bot the offer
+// lists as the seller's contact.
+test('the landing footer links to the public offer and the feedback bot', async ({ page }) => {
   await page.goto('/landing.html');
   await expect(page.getByText(/Играй в «Эрудита»/)).toBeVisible(); // Russian by default
 
   const offer = page.getByRole('link', { name: 'Публичная оферта' });
   await expect(offer).toBeVisible();
   expect(await offer.getAttribute('href')).toBe('/offer/');
+
+  const feedback = page.getByRole('link', { name: 'Обратная связь' });
+  await expect(feedback).toBeVisible();
+  expect(await feedback.getAttribute('href')).toBe('https://t.me/Erudit_GameBot');
 });

ui/legal/offer_ru.md

@@ -20,6 +20,8 @@
 
 **Сайт Продавца в сети «Интернет»** — совокупность программ для электронных вычислительных машин и иной информации, содержащейся в информационной системе, доступ к которой обеспечивается посредством сети «Интернет» по доменному имени и сетевому адресу: `erudit-game.ru`.
 
+**Приложение Продавца** - предоставляемое Продавцом для загрузки из сети «Интернет», добровольно загружаемое Покупателем и исполняемое на электронной вычислительной машине (устройстве) Покупателя программное обеспечение, предоставляющее игровые или иные функции и позволяющее Покупателю взимодействовать с Продавцом путём осуществления сделок купли-продажи внутригровых ценностей. Приложение может распространяться в форматах, но не ограничиваясь, такими как: веб-приложение на Сайте Продавца, мини-приложение в экосистеме VK, мини-приложение в экосистеме Telegram, Android-приложение в экосистеме Google Play, Android-приложение в экосистеме RuStore, iOS-приложение в экосистеме Apple App Store и дугих форматах распространения.
+
 **Стороны Договора (Стороны)** — Продавец и Покупатель.
 
 **Товар** — товаром по договору купли-продажи могут быть любые вещи с соблюдением правил, предусмотренных статьей 129 Гражданского кодекса РФ.
@@ -28,13 +30,13 @@
 
 **2.1.** По настоящему Договору Продавец обязуется передать вещь (Товар) в собственность Покупателя, а Покупатель обязуется принять Товар и уплатить за него определенную денежную сумму.
 
-**2.2.** Наименование, количество, а также ассортимент Товара, его стоимость, порядок доставки и иные условия определяются на основании сведений Продавца при оформлении заявки Покупателем, либо устанавливаются на сайте Продавца в сети «Интернет» `erudit-game.ru`.
+**2.2.** Наименование, количество, а также ассортимент Товара, его стоимость, порядок доставки и иные условия определяются на основании сведений Продавца при оформлении заявки Покупателем, либо устанавливаются на Сайте Продавца в сети «Интернет», либо в Приложении Продавца.
 
 **2.3.** Акцепт настоящей Оферты выражается в совершении конклюдентных действий, в частности:
 
-- действиях, связанных с регистрацией учетной записи на Сайте Продавца в сети «Интернет» при наличии необходимости регистрации учетной записи;
+- действиях, связанных с регистрацией учетной записи на Сайте Продавца в сети «Интернет» либо в Приложении Продавца при наличии необходимости регистрации учетной записи;
 - путем составления и заполнения заявки на оформление заказа Товара;
-- путем сообщения требуемых для заключения Договора сведений по телефону, электронной почте, указанными на сайте Продавца в сети «Интернет», в том числе, при обратном звонке Продавца по заявке Покупателя;
+- путем сообщения требуемых для заключения Договора сведений по телефону, электронной почте, указанными на Сайте Продавца в сети «Интернет» либо в Приложении Продавца, в том числе, при обратном звонке Продавца по заявке Покупателя;
 - оплаты Товара Покупателем.
 
 Данный перечень не является исчерпывающим, могут быть и другие действия, которые ясно выражают намерение лица принять предложение контрагента.
@@ -76,10 +78,16 @@
 
 ## 4. Цена и порядок расчетов
 
-**4.1.** Стоимость, а также порядок оплаты Товара определяется на основании сведений Продавца при оформлении заявки Покупателем, либо устанавливаются на сайте Продавца в сети «Интернет»: `erudit-game.ru`.
+**4.1.** Стоимость, а также порядок оплаты Товара определяется на основании сведений Продавца при оформлении заявки Покупателем, либо устанавливаются на Сайте Продавца в сети «Интернет» а так же в Приложении Продавца.
 
 **4.2.** Все расчеты по Договору производятся в безналичном порядке.
 
+**4.3.** Порядок расчётов. Приобретаемым Товаром является внутриигровая валюта «Фишка» — условная учётная единица, используемая исключительно в пределах Сайта Продавца либо в Приложения Продавца. «Фишки» предоставляют Покупателю возможность получения внутриигровых благ и дополнительных функций, включая, но не ограничиваясь: отказ от показа рекламы, приобретение подсказок в игре и иные внутриигровые возможности. «Фишка» не является электронным средством платежа либо денежным средством, не подлежит обмену на денежные средства и не может быть использована за пределами Сайта Продавца либо Приложения Продавца. «Фишки» зачисляются на внутриигровой счёт Покупателя единовременно после поступления оплаты; дальнейшее их использование для получения внутриигровых благ осуществляется Покупателем самостоятельно в рамках используемого Сайта Продавца либо Приложения Продавца.
+
+**4.4.** Стоимость Товаров:
+
+<#pricing_template#>
+
 ## 5. Обмен и возврат Товара
 
 **5.1.** Покупатель вправе осуществить возврат (обмен) Продавцу Товара, приобретенный дистанционным способом, за исключением перечня товаров, не подлежащих обмену и возврату согласно действующему законодательству Российской Федерации. Условия, сроки и порядок возврата Товара надлежащего и ненадлежащего качества установлены в соответствии с Гражданским кодексом РФ, Закона РФ от 07.02.1992 N 2300-1 «О защите прав потребителей», Правил, утвержденных Постановлением Правительства РФ от 31.12.2020 N 2463.
@@ -120,7 +128,7 @@
 
 **9.3.** Договор вступает в силу с момента Акцепта условий настоящей Оферты Покупателем и действует до полного исполнения Сторонами обязательств по Договору.
 
-**9.4.** Изменения, внесенные Продавцом в Договор и опубликованные на сайте в форме актуализированной Оферты, считаются принятыми Покупателем в полном объеме.
+**9.4.** Изменения, внесенные Продавцом в Договор и опубликованные на Сайте Продавца в форме актуализированной Оферты, считаются принятыми Покупателем в полном объеме при оплате Товаров.
 
 ## 10. Дополнительные условия
 
@@ -138,8 +146,10 @@
 
 **10.5.** Бездействие одной из Сторон в случае нарушения условий настоящей Оферты не лишает права заинтересованной Стороны осуществлять защиту своих интересов позднее, а также не означает отказа от своих прав в случае совершения одной из Сторон подобных либо сходных нарушений в будущем.
 
-**10.6.** Если на Сайте Продавца в сети «Интернет» есть ссылки на другие веб-сайты и материалы третьих лиц, такие ссылки размещены исключительно в целях информирования, и Продавец не имеет контроля в отношении содержания таких сайтов или материалов. Продавец не несет ответственность за любые убытки или ущерб, которые могут возникнуть в результате использования таких ссылок.
+**10.6.** Если на Сайте Продавца в сети «Интернет» либо в Приложении Продавца есть ссылки на другие веб-сайты и материалы третьих лиц, такие ссылки размещены исключительно в целях информирования, и Продавец не имеет контроля в отношении содержания таких сайтов или материалов. Продавец не несет ответственность за любые убытки или ущерб, которые могут возникнуть в результате использования таких ссылок.
 
 ## 11. Реквизиты Продавца
 
 Денисов Илья Аркадьевич, ИНН 290210610742.
+
+Обратная связь в Telegram: [@Erudit_GameBot](https://t.me/Erudit_GameBot).

ui/src/Landing.svelte

@@ -125,7 +125,13 @@
   </section>
 
   <footer class="ft">
-    <a class="offer" href="/offer/">{t('landing.offer')}</a>
+    <span class="legal">
+      <a class="offer" href="/offer/">{t('landing.offer')}</a>
+      <span class="sep" aria-hidden="true">|</span>
+      <!-- The feedback bot: the same Telegram contact the offer lists (section 11 «Реквизиты»);
+           external, opens in a new tab. -->
+      <a class="offer" href="https://t.me/Erudit_GameBot" target="_blank" rel="noopener noreferrer">{t('landing.feedback')}</a>
+    </span>
     <span>{t('about.version', { v: __APP_VERSION__ })}</span>
   </footer>
 </main>
@@ -287,6 +293,14 @@
     color: var(--text-muted);
     font-size: 0.8rem;
   }
+  .ft .legal {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+  }
+  .ft .sep {
+    color: var(--text-muted);
+  }
   .ft .offer {
     color: inherit;
   }

ui/src/lib/i18n/en.ts

@@ -285,6 +285,7 @@ export const en = {
   'landing.captionVK': 'VK',
   'landing.captionWeb': 'Web',
   'landing.offer': 'Public offer',
+  'landing.feedback': 'Feedback',
 
   'install.title': 'Install the app',
   'install.subtitle': 'Put the app icon on your desktop (home screen) to open the game in one tap.',

ui/src/lib/i18n/ru.ts

@@ -285,6 +285,7 @@ export const ru: Record<MessageKey, string> = {
   'landing.captionVK': 'VK',
   'landing.captionWeb': 'Веб-версия',
   'landing.offer': 'Публичная оферта',
+  'landing.feedback': 'Обратная связь',
 
   'install.title': 'Установить приложение',
   'install.subtitle': 'Поместите иконку приложения на рабочий стол (домашний экран), чтобы открывать игру одним нажатием.',

ui/src/lib/offer.test.ts

@@ -10,8 +10,8 @@ describe('renderOfferHtml', () => {
     // The markdown heading is rendered, not left as literal source.
     expect(html).toContain('<h1>Публичная оферта</h1>');
     expect(html).not.toContain('# Публичная оферта');
-    // A back link to the landing root is always present.
-    expect(html).toContain('href="/"');
+    // No in-page navigation: the standalone offer carries no "back" link.
+    expect(html).not.toContain('class="back"');
   });
 
   it('renders headings, bold clause numbers and lists', () => {

ui/src/lib/offer.ts

@@ -2,13 +2,15 @@ import { marked } from 'marked';
 
 /**
  * renderOfferHtml renders the public-offer markdown source into a standalone,
- * self-contained HTML document served statically at `/offer/`. The build emits
- * the result as `dist/offer/index.html` (see the `emit-offer` plugin in
- * `vite.config.ts`), which the landing container serves.
+ * self-contained HTML document served at `/offer/`. It runs server-side in the
+ * render sidecar (`renderer/src/offer.mjs`), which reads the owner-edited
+ * `ui/legal/offer_ru.md`, splices the live catalog price list into it and calls
+ * this function — one renderer shared with the browser build, kept unit-tested
+ * here (`offer.test.ts`).
  *
- * The input `markdown` is trusted repository content (the owner-edited
- * `ui/legal/offer_ru.md`), not user input, so the rendered HTML is deliberately
- * not sanitised. The page carries its own minimal light/dark styling so it needs
+ * The input `markdown` is trusted repository content plus the backend's own
+ * catalog projection, not user input, so the rendered HTML is deliberately not
+ * sanitised. The page carries its own minimal light/dark styling so it needs
  * neither the app bundle nor `app.css`.
  */
 export function renderOfferHtml(markdown: string): string {
@@ -29,6 +31,7 @@ export function renderOfferHtml(markdown: string): string {
         --text: #1a1c20;
         --accent: #2563eb;
         --rule: #e5e7eb;
+        --cell-border: #d1d5db;
       }
       @media (prefers-color-scheme: dark) {
         :root {
@@ -36,6 +39,9 @@ export function renderOfferHtml(markdown: string): string {
           --text: #e7e9ee;
           --accent: #6ea8fe;
           --rule: #242832;
+          /* A muted grey — the section rules (--rule) vanish on the dark background, so table cells
+             get a slightly firmer border to stay legible without being loud. */
+          --cell-border: #3a4250;
         }
       }
       * {
@@ -55,11 +61,6 @@ export function renderOfferHtml(markdown: string): string {
       a {
         color: var(--accent);
       }
-      .back {
-        display: inline-block;
-        margin-bottom: 20px;
-        text-decoration: none;
-      }
       h1 {
         font-size: 1.6rem;
         text-align: center;
@@ -80,11 +81,35 @@ export function renderOfferHtml(markdown: string): string {
       li {
         margin: 0.25em 0;
       }
+      /* The price tables (§4.4) span the full content width. */
+      table {
+        width: 100%;
+        border-collapse: collapse;
+        margin: 0.75em 0 1.25em;
+        font-size: 0.95rem;
+      }
+      th,
+      td {
+        border: 1px solid var(--cell-border);
+        padding: 6px 10px;
+      }
+      /* The product-name column shrinks to its content and never wraps; the price columns share the
+         rest of the width (width:1% is the shrink-to-fit idiom paired with the table's width:100%). */
+      th:first-child,
+      td:first-child {
+        width: 1%;
+        white-space: nowrap;
+      }
+      /* Right-aligned price columns. marked emits the alignment from the "---:" separator; this rule
+         keeps it applied whether that surfaces as an align attribute or an inline style. */
+      th[align='right'],
+      td[align='right'] {
+        text-align: right;
+      }
     </style>
   </head>
   <body>
     <main>
-      <a class="back" href="/">← На главную</a>
       ${body}
     </main>
   </body>

ui/vite.config.ts

@@ -3,7 +3,6 @@ import { resolve } from 'node:path';
 import { defineConfig, type Plugin } from 'vite';
 import { svelte } from '@sveltejs/vite-plugin-svelte';
 import { VitePWA } from 'vite-plugin-pwa';
-import { renderOfferHtml } from './src/lib/offer';
 
 /**
  * injectBootVersion stamps the app version into index.html's boot-capability guard, replacing its
@@ -39,22 +38,6 @@ function emitPolyfills(): Plugin {
   };
 }
 
-/**
- * emitOffer renders the public offer markdown (legal/offer_ru.md) to a standalone
- * static page and emits it as dist/offer/index.html, which the landing container
- * serves at /offer/ (deploy/landing/Caddyfile). The markdown is the owner-editable
- * source of truth, so the page is regenerated from it on every build.
- */
-function emitOffer(): Plugin {
-  return {
-    name: 'emit-offer',
-    generateBundle() {
-      const md = readFileSync(resolve(import.meta.dirname, 'legal/offer_ru.md'), 'utf8');
-      this.emitFile({ type: 'asset', fileName: 'offer/index.html', source: renderOfferHtml(md) });
-    },
-  };
-}
-
 // The edge Connect service is scrabble.edge.v1.Gateway; the gateway serves it over
 // h2c on :8081 by default. In dev we proxy the RPC path so the browser (which can
 // not speak h2c directly) talks to the dev server on the same origin. In `mock`
@@ -77,7 +60,6 @@ export default defineConfig(({ mode }) => ({
   plugins: [
     svelte(),
     emitPolyfills(),
-    emitOffer(),
     injectBootVersion(),
     // App-shell precache for the offline mode: a custom (injectManifest) service worker precaches
     // index.html + the hashed assets so the installed web PWA cold-launches with no network. It