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.

ui/src/lib/codec.ts

@@ -146,6 +146,14 @@ export function encodeChatPost(gameId: string, body: string): Uint8Array {
   return finish(b, fb.ChatPostRequest.endChatPostRequest(b));
 }
 
+export function encodeTelegramLogin(initData: string): Uint8Array {
+  const b = new Builder(512);
+  const d = b.createString(initData);
+  fb.TelegramLoginRequest.startTelegramLoginRequest(b);
+  fb.TelegramLoginRequest.addInitData(b, d);
+  return finish(b, fb.TelegramLoginRequest.endTelegramLoginRequest(b));
+}
+
 export function encodeGuestLogin(locale: string): Uint8Array {
   const b = new Builder(64);
   const l = b.createString(locale);
@@ -264,6 +272,7 @@ export function decodeProfile(buf: Uint8Array): Profile {
     blockChat: p.blockChat(),
     blockFriendRequests: p.blockFriendRequests(),
     isGuest: p.isGuest(),
+    notificationsInAppOnly: p.notificationsInAppOnly(),
   };
 }
 
@@ -444,6 +453,7 @@ export function encodeUpdateProfile(p: ProfileUpdate): Uint8Array {
   fb.UpdateProfileRequest.addAwayEnd(b, ae);
   fb.UpdateProfileRequest.addBlockChat(b, p.blockChat);
   fb.UpdateProfileRequest.addBlockFriendRequests(b, p.blockFriendRequests);
+  fb.UpdateProfileRequest.addNotificationsInAppOnly(b, p.notificationsInAppOnly);
   return finish(b, fb.UpdateProfileRequest.endUpdateProfileRequest(b));
 }