fix(auth): import get_password_hash in main.py

backend/main.py

@@ -9,7 +9,7 @@ from pathlib import Path
 from typing import Optional, List
 import json
 
-from database import get_db, create_access_token, verify_password, init_db, Base, engine
+from database import get_db, create_access_token, verify_password, get_password_hash, init_db, Base, engine
 from models import User, AttendanceRecord, Shift, Accident, Holiday, LeaveRecord
 from sqlalchemy import func as sqlfunc
 from schemas import *