Fix worker getting stuck during sync: add timeouts, stuck detection, and safety limits

- Add invokeWithTimeout wrapper for TDLib API calls (2min timeout per call)
- Add stuck detection to getChannelMessages: break if from_message_id doesn't advance
- Add stuck detection to getTopicMessages: same protection for topic scanning
- Add stuck detection to getForumTopicList: break if pagination offsets don't advance
- Add max page limit (5000) to all scanning loops to prevent infinite pagination
- Add mutex wait timeout (30min) to prevent indefinite blocking when holder hangs
- Add cycle timeout (4h default, configurable via WORKER_CYCLE_TIMEOUT_MINUTES)
- Fix end-of-page detection to use actual limit value instead of hardcoded 100

Co-authored-by: xCyanGrizzly <53275238+xCyanGrizzly@users.noreply.github.com>

worker/dist/tdlib/client.d.ts

@@ -0,0 +1,18 @@
+import { type Client } from "tdl";
+interface AccountConfig {
+    id: string;
+    phone: string;
+}
+/**
+ * Create and authenticate a TDLib client for a Telegram account.
+ * Authentication flow communicates with the admin UI via the database:
+ * - Worker sets authState to AWAITING_CODE when TDLib asks for phone code
+ * - Admin enters the code via UI, which writes it to authCode field
+ * - Worker polls DB for the code and feeds it to TDLib
+ */
+export declare function createTdlibClient(account: AccountConfig): Promise<Client>;
+/**
+ * Close a TDLib client gracefully.
+ */
+export declare function closeTdlibClient(client: Client): Promise<void>;
+export {};