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/archive/multipart.d.ts

@@ -0,0 +1,19 @@
+import { type ArchiveFormat } from "./detect.js";
+export interface TelegramMessage {
+    id: bigint;
+    fileName: string;
+    fileId: string;
+    fileSize: bigint;
+    date: Date;
+}
+export interface ArchiveSet {
+    type: ArchiveFormat;
+    baseName: string;
+    parts: TelegramMessage[];
+    isMultipart: boolean;
+}
+/**
+ * Group messages into archive sets (single files + multipart groups).
+ * Messages should be pre-filtered to only include archive attachments.
+ */
+export declare function groupArchiveSets(messages: TelegramMessage[]): ArchiveSet[];