Renamed schemas to schema as per naming conventions

app/api/v1/vendor/auth.py

@@ -16,7 +16,7 @@ from app.core.database import get_db
 from app.services.auth_service import auth_service
 from app.exceptions import InvalidCredentialsException
 from middleware.vendor_context import get_current_vendor
-from models.schemas.auth import LoginResponse, UserLogin
+from models.schema.auth import LoginResponse, UserLogin
 from models.database.vendor import Vendor
 
 router = APIRouter()