refactor(payments): one canonical catalog order for storefront, offer, admin; admin active/all toggle

The wallet storefront listed products in creation order — its purchases and its
chip-exchange values were unsorted, unlike the admin console and the public offer.
Extract the ordering (chip packs first by rouble price, then chip-priced values
grouped hints → no-ads → combo → tournament and by chip price) into one comparator,
compareCatalogRank over a small rank key, and apply it at all three sites
(projectCatalog, projectOfferPricing, SortAdminCatalog) — so the subgroup ranking
(valueGroup) and the full order now live in one place. The rewarded "watch for
chips" CTA is a wallet-driven element rendered above the packs, so it is unaffected
and stays on top.

Also add the admin catalog active/all toggle: AdminCatalog takes includeInactive,
the console shows active products by default and ?all=1 lists archived ones too
(the detail and grant forms keep loading all products).

Tests: a storefront canonical-order unit test (reproduced the unsorted bug first);
an integration test for the active/all toggle. Existing offer/admin order tests
unchanged — behaviour preserved.

backend/internal/payments/offer.go

@@ -1,7 +1,6 @@
 package payments
 
 import (
-	"cmp"
 	"context"
 	"fmt"
 	"math"
@@ -60,8 +59,13 @@ func (s *Service) buildOfferPricing(ctx context.Context) (string, error) {
 // 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 {
+	// Order the whole catalog once by the shared canonical rank, then split it into the two offer
+	// tables (packs first, then the chip-exchange values); each keeps that order. Sort a copy so the
+	// caller's slice is left untouched.
+	sorted := slices.Clone(entries)
+	sortCatalogEntries(sorted)
 	var packs, values []catalogEntry
-	for _, e := range entries {
+	for _, e := range sorted {
 		if isPackEntry(e) {
 			packs = append(packs, e)
 		} else {
@@ -69,18 +73,6 @@ func projectOfferPricing(entries []catalogEntry) string {
 		}
 	}
 
-	// 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")