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/upload/channel.d.ts

@@ -0,0 +1,16 @@
+import type { Client } from "tdl";
+export interface UploadResult {
+    messageId: bigint;
+}
+/**
+ * Upload one or more files to a destination Telegram channel.
+ * For multipart archives, each file is sent as a separate message.
+ * Returns the **final** (server-assigned) message ID of the first uploaded message.
+ *
+ * IMPORTANT: `sendMessage` returns a *temporary* message immediately.
+ * The actual file upload happens asynchronously in TDLib. We listen for
+ * `updateMessageSendSucceeded` to get the real server-side message ID and
+ * to make sure the upload is fully committed before we clean up temp files
+ * or close the TDLib client (which would cancel pending uploads).
+ */
+export declare function uploadToChannel(client: Client, chatId: bigint, filePaths: string[], caption?: string): Promise<UploadResult>;