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/handlers_account.go

@@ -18,13 +18,14 @@ import (
 // updateProfileRequest is the full editable profile. away_start/away_end are
 // "HH:MM" local-time bounds of the daily away window.
 type updateProfileRequest struct {
-	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"`
-	BlockChat           bool   `json:"block_chat"`
-	BlockFriendRequests bool   `json:"block_friend_requests"`
+	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"`
+	BlockChat              bool   `json:"block_chat"`
+	BlockFriendRequests    bool   `json:"block_friend_requests"`
+	NotificationsInAppOnly bool   `json:"notifications_in_app_only"`
 }
 
 // statsDTO is a durable account's lifetime statistics (the derived games-played and
@@ -80,13 +81,14 @@ func (s *Server) handleUpdateProfile(c *gin.Context) {
 		return
 	}
 	acc, err := s.accounts.UpdateProfile(c.Request.Context(), uid, account.ProfileUpdate{
-		DisplayName:         req.DisplayName,
-		PreferredLanguage:   req.PreferredLanguage,
-		TimeZone:            req.TimeZone,
-		AwayStart:           awayStart,
-		AwayEnd:             awayEnd,
-		BlockChat:           req.BlockChat,
-		BlockFriendRequests: req.BlockFriendRequests,
+		DisplayName:            req.DisplayName,
+		PreferredLanguage:      req.PreferredLanguage,
+		TimeZone:               req.TimeZone,
+		AwayStart:              awayStart,
+		AwayEnd:                awayEnd,
+		BlockChat:              req.BlockChat,
+		BlockFriendRequests:    req.BlockFriendRequests,
+		NotificationsInAppOnly: req.NotificationsInAppOnly,
 	})
 	if err != nil {
 		s.abortErr(c, err)