feat: add sign-out redirect URL and enhance sign-in redirect handling

backend/migrations/env.py

@@ -4,11 +4,10 @@ import sys
 from logging.config import fileConfig
 from pathlib import Path
 
+from alembic import context
 from sqlalchemy import engine_from_config, pool
 from sqlmodel import SQLModel
 
-from alembic import context
-
 PROJECT_ROOT = Path(__file__).resolve().parents[1]
 if str(PROJECT_ROOT) not in sys.path:
     sys.path.append(str(PROJECT_ROOT))