Fix cron expression in Calendar Sync Cron Job to trigger at second 0 and update entity retrieval methods in Beteiligte Sync steps for consistency

steps/vmh/beteiligte_sync_event_step.py

@@ -37,9 +37,9 @@ config = {
 
 async def handler(event_data: Dict[str, Any], ctx: FlowContext[Any]):
     """Zentraler Sync-Handler für Beteiligte"""
-    entity_id = event_data.entity_id
-    action = event_data.action
-    source = event_data.source
+    entity_id = event_data.get('entity_id')
+    action = event_data.get('action')
+    source = event_data.get('source')
     
     if not entity_id:
         ctx.logger.error("Keine entity_id im Event gefunden")