Stage 9: Telegram integration (connector side-service, Mini App, out-of-app push)

New platform/telegram connector (own container, bot token only there):
- go-telegram/bot long-poll loop: /start deep-links + Mini App launch button.
- gRPC API pkg/proto/telegram/v1 (Telegram service): ValidateInitData, Notify
  (renders a localized message + deep-link button), SendToUser/SendToGameChannel
  (admin, wired in Stage 10). Generic methods are platform-agnostic (external_id).
- Bot API base override for Telegram's test environment; Dockerfile + compose
  (VPN sidecar, no public ingress); README.

Gateway:
- initData validation relocated from the gateway into the connector; the gateway
  calls ValidateInitData over gRPC (GATEWAY_CONNECTOR_ADDR), drops the bot token,
  and deletes internal/auth.
- Out-of-app push: runPushPump routes events whose recipient has no live in-app
  stream to connector.Notify, gated by /internal/push-target + the in-app-only
  flag (race-free de-dup); HasSubscribers added to the push hub.

Backend:
- Migration 00007 accounts.notifications_in_app_only (default true) + jetgen.
- ProvisionTelegram seeds a new account's language/display name from the launch
  fields; IdentityExternalID reverse lookup; /internal/push-target handler.

UI:
- Telegram Mini App launch: detect initData, apply themeParams, authTelegram,
  route the deep-link start_param (g/i/f); /telegram/ guard redirects outside
  Telegram. Vite relative base + telegram-web-app.js. In-app-only profile toggle;
  share-to-Telegram link for a friend code. Vitest + Playwright coverage.

Wire/docs/CI: fbs Profile/UpdateProfileRequest gain notifications_in_app_only
(Go + TS); go.work uses ./platform/telegram; go-unit.yaml covers it; PLAN,
ARCHITECTURE, FUNCTIONAL (+ru), UI_DESIGN, READMEs updated.

backend/internal/server/dto.go

@@ -35,16 +35,17 @@ type resolveResponse struct {
 // profileResponse is the authenticated account's own profile. AwayStart and AwayEnd
 // are the daily away window's "HH:MM" local-time bounds (in TimeZone).
 type profileResponse struct {
-	UserID              string `json:"user_id"`
-	DisplayName         string `json:"display_name"`
-	PreferredLanguage   string `json:"preferred_language"`
-	TimeZone            string `json:"time_zone"`
-	AwayStart           string `json:"away_start"`
-	AwayEnd             string `json:"away_end"`
-	HintBalance         int    `json:"hint_balance"`
-	BlockChat           bool   `json:"block_chat"`
-	BlockFriendRequests bool   `json:"block_friend_requests"`
-	IsGuest             bool   `json:"is_guest"`
+	UserID                 string `json:"user_id"`
+	DisplayName            string `json:"display_name"`
+	PreferredLanguage      string `json:"preferred_language"`
+	TimeZone               string `json:"time_zone"`
+	AwayStart              string `json:"away_start"`
+	AwayEnd                string `json:"away_end"`
+	HintBalance            int    `json:"hint_balance"`
+	BlockChat              bool   `json:"block_chat"`
+	BlockFriendRequests    bool   `json:"block_friend_requests"`
+	IsGuest                bool   `json:"is_guest"`
+	NotificationsInAppOnly bool   `json:"notifications_in_app_only"`
 }
 
 // tileDTO is one placed (or to-place) tile.
@@ -148,16 +149,17 @@ func sessionResponseFor(token string, acc account.Account) sessionResponse {
 // profileResponseFor projects an account into its profile DTO.
 func profileResponseFor(acc account.Account) profileResponse {
 	return profileResponse{
-		UserID:              acc.ID.String(),
-		DisplayName:         acc.DisplayName,
-		PreferredLanguage:   acc.PreferredLanguage,
-		TimeZone:            acc.TimeZone,
-		AwayStart:           acc.AwayStart.Format(awayTimeLayout),
-		AwayEnd:             acc.AwayEnd.Format(awayTimeLayout),
-		HintBalance:         acc.HintBalance,
-		BlockChat:           acc.BlockChat,
-		BlockFriendRequests: acc.BlockFriendRequests,
-		IsGuest:             acc.IsGuest,
+		UserID:                 acc.ID.String(),
+		DisplayName:            acc.DisplayName,
+		PreferredLanguage:      acc.PreferredLanguage,
+		TimeZone:               acc.TimeZone,
+		AwayStart:              acc.AwayStart.Format(awayTimeLayout),
+		AwayEnd:                acc.AwayEnd.Format(awayTimeLayout),
+		HintBalance:            acc.HintBalance,
+		BlockChat:              acc.BlockChat,
+		BlockFriendRequests:    acc.BlockFriendRequests,
+		IsGuest:                acc.IsGuest,
+		NotificationsInAppOnly: acc.NotificationsInAppOnly,
 	}
 }