refactor(logging): standardize logging approach across services and steps

services/document_sync_utils.py

@@ -10,12 +10,9 @@ Hilfsfunktionen für Document-Synchronisation mit xAI:
 
 from typing import Dict, Any, Optional, List, Tuple
 from datetime import datetime, timedelta
-import logging
 
 from services.sync_utils_base import BaseSyncUtils
 
-logger = logging.getLogger(__name__)
-
 # Max retry before permanent failure
 MAX_SYNC_RETRIES = 5