refactor(logging): remove unused logger instances and enhance error logging in webhook steps

steps/vmh/webhook/beteiligte_update_api_step.py

@@ -71,7 +71,11 @@ async def handler(request: ApiRequest, ctx: FlowContext[Any]) -> ApiResponse:
     except Exception as e:
         ctx.logger.error("=" * 80)
         ctx.logger.error("❌ ERROR: VMH UPDATE WEBHOOK")
+        ctx.logger.error("=" * 80)
         ctx.logger.error(f"Error: {e}")
+        ctx.logger.error(f"Entity IDs attempted: {list(entity_ids) if 'entity_ids' in locals() else 'N/A'}")
+        ctx.logger.error(f"Full Payload: {json.dumps(request.body, indent=2, ensure_ascii=False)}")
+        ctx.logger.error(f"Timestamp: {datetime.datetime.now().isoformat()}")
         ctx.logger.error("=" * 80)
         return ApiResponse(
             status=500,