Fix missing shutil import in LoRA training service - Adds shutil and zipfile imports for LoRA import/export operations - Fixes NameError when uploading trained LoRAs

backend/services/lora_training_service.py

@@ -13,6 +13,8 @@ from typing import Dict, List, Optional, Callable
 import soundfile as sf
 import numpy as np
 import time
+import shutil
+import zipfile
 from datetime import datetime
 
 logger = logging.getLogger(__name__)