fix: update test imports from auth to auth_service

dashboard/backend/tests/conftest.py

@@ -72,7 +72,7 @@ def temp_rbac_file(temp_volume_root):
 @pytest.fixture
 def valid_access_token(mock_config):
     """Generate a valid access token for testing."""
-    from auth import create_access_token
+    from auth_service import create_access_token
     return create_access_token(
         data={"sub": "testuser", "role": "admin"},
         expires_delta=timedelta(minutes=30)
@@ -82,14 +82,14 @@ def valid_access_token(mock_config):
 @pytest.fixture
 def valid_refresh_token(mock_config, temp_auth_file):
     """Generate a valid refresh token for testing."""
-    from auth import create_refresh_token
+    from auth_service import create_refresh_token
     return create_refresh_token(data={"sub": "testuser", "role": "admin"})
 
 
 @pytest.fixture
 def expired_access_token(mock_config):
     """Generate an expired access token for testing."""
-    from auth import create_access_token
+    from auth_service import create_access_token
     return create_access_token(
         data={"sub": "testuser", "role": "admin"},
         expires_delta=timedelta(seconds=-1)