fix: WhatsApp-Polling als eigene Schleife statt APScheduler (kein Overlap mehr)

main.py

@@ -20,7 +20,6 @@ from channels.whatsapp_channel import WhatsAppChannel
 from config import settings
 from db.database import init_db
 from services import message_service
-from tasks.receiver import build_scheduler
 
 logging.basicConfig(
     level=logging.INFO,
@@ -67,11 +66,7 @@ async def main(with_tui: bool = True) -> None:
     await whatsapp.start()
     await sms.start()
 
-    # 6. Hintergrund-Tasks starten (WhatsApp-Polling etc.)
-    scheduler = build_scheduler(whatsapp)
-    scheduler.start()
-
-    # 7. Uvicorn als Hintergrund-Task starten
+    # 6. Uvicorn als Hintergrund-Task starten
     api_task = asyncio.create_task(_run_api(), name="mcm-api")
     logger.info("API running on http://%s:%d", settings.host, settings.port)
 
@@ -91,7 +86,6 @@ async def main(with_tui: bool = True) -> None:
                 pass
     finally:
         logger.info("MCM shutting down…")
-        scheduler.shutdown(wait=False)
         api_task.cancel()
         try:
             await api_task