style: apply ruff formatting to source and test files

tests/api/conftest.py

@@ -1,6 +1,6 @@
 """API test fixtures."""
 
-from typing import AsyncGenerator
+from collections.abc import AsyncGenerator
 from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
@@ -25,7 +25,7 @@ def mock_keycloak_client() -> MagicMock:
 
 
 @pytest.fixture
-async def client(mock_keycloak_client: MagicMock) -> AsyncGenerator[AsyncClient, None]:
+async def client(mock_keycloak_client: MagicMock) -> AsyncGenerator[AsyncClient]:
     """Create async HTTP client for API testing."""
     with patch(
         "app.presentation.api.deps.KeycloakAuthClient",