feat(myTischtennis): implement asynchronous team data fetching and job status tracking

- Added a new endpoint to start an asynchronous job for fetching team data, allowing for non-blocking operations.
- Implemented job status tracking to retrieve the status of ongoing fetch jobs, enhancing user experience with real-time updates.
- Updated the frontend to initiate async fetch requests and poll for job completion, improving data retrieval efficiency and user feedback.

backend/routes/myTischtennisRoutes.js

@@ -64,6 +64,12 @@ router.post('/configure-league', myTischtennisUrlController.configureLeague);
 // POST /api/mytischtennis/fetch-team-data - Manually fetch team data
 router.post('/fetch-team-data', myTischtennisUrlController.fetchTeamData);
 
+// POST /api/mytischtennis/fetch-team-data/async - Start async manual fetch
+router.post('/fetch-team-data/async', myTischtennisUrlController.startFetchTeamDataJob);
+
+// GET /api/mytischtennis/fetch-team-data/jobs/:jobId - Get async fetch job status
+router.get('/fetch-team-data/jobs/:jobId', myTischtennisUrlController.getFetchTeamDataJobStatus);
+
 // GET /api/mytischtennis/team-url/:teamId - Get myTischtennis URL for team
 router.get('/team-url/:teamId', myTischtennisUrlController.getTeamUrl);