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/screens/Profile.svelte

@@ -25,6 +25,7 @@
   let endM = $state('00');
   let blockChat = $state(false);
   let blockFriendRequests = $state(false);
+  let notificationsInAppOnly = $state(true);
   let emailInput = $state('');
   let codeInput = $state('');
   let emailSent = $state(false);
@@ -47,6 +48,7 @@
     [endH, endM] = splitTime(p.awayEnd);
     blockChat = p.blockChat;
     blockFriendRequests = p.blockFriendRequests;
+    notificationsInAppOnly = p.notificationsInAppOnly;
     editing = true;
   }
 
@@ -68,6 +70,7 @@
         awayEnd,
         blockChat,
         blockFriendRequests,
+        notificationsInAppOnly,
       });
       editing = false;
       showToast(t('profile.saved'));
@@ -143,6 +146,10 @@
             <input type="checkbox" bind:checked={blockFriendRequests} />
             <span>{t('profile.blockFriendRequests')}</span>
           </label>
+          <label class="check">
+            <input type="checkbox" bind:checked={notificationsInAppOnly} />
+            <span>{t('profile.notificationsInAppOnly')}</span>
+          </label>
           <div class="formacts">
             <button type="submit" class="btn" disabled={!formValid}>{t('common.save')}</button>
             <button type="button" class="ghost" onclick={() => (editing = false)}>{t('common.cancel')}</button>