Add Telegram cancellation import functionality with tests and documentation

- Implemented Telegram cancellation parsing logic in `telegramCancellationParser.js`.
- Created unit tests for cancellation parsing in `telegramCancellationParser.test.js`.
- Developed integration tests for Telegram import service in `telegramImport.integration.test.js`.
- Added API tests for Telegram import endpoints in `telegramImportApi.test.js`.
- Introduced service tests for Telegram import logic in `telegramImportService.test.js`.
- Documented the Telegram cancellation import process in `telegram-cancellation-import.md`.
- Built a React component for managing Telegram imports in `TelegramImportPanel.jsx`.

backend/src/index.js

@@ -13,11 +13,13 @@ const { ensureRealtimeSchema } = require('./services/realtimeSchema');
 const { attachRealtimeServer, closeRealtimeServer } = require('./services/realtimeService');
 const { ensureBootstrapAdmin } = require('./utils/bootstrapAdmin');
 const { startAlertScheduler } = require('./services/alertSchedulerService');
+const { startTelegramImporter } = require('./services/telegramImportService');
 
 const app = express();
 const PORT = process.env.PORT || 3000;
 let server;
 let stopAlertScheduler = () => {};
+let stopTelegramImporter = () => Promise.resolve();
 
 // Security middleware
 app.use(helmet({
@@ -128,6 +130,7 @@ function shutdown(signal) {
 
   closeRealtimeServer();
   stopAlertScheduler();
+  stopTelegramImporter().catch(() => {});
 
   if (!server) {
     process.exit(0);
@@ -168,6 +171,7 @@ async function startServer() {
     await ensureRealtimeSchema();
     await ensureBootstrapAdmin();
     stopAlertScheduler = startAlertScheduler();
+    stopTelegramImporter = startTelegramImporter();
 
     server = app.listen(PORT, () => {
       logger.info(`Server is running on port ${PORT}`);