Refactor tests for improved consistency and readability

- Updated test cases in `test_auth_endpoints.py` to ensure consistent formatting and style.
- Enhanced `test_socket_endpoints.py` with consistent parameter formatting and improved readability.
- Cleaned up `conftest.py` by ensuring consistent parameter formatting in fixtures.
- Added comprehensive tests for API token dependencies in `test_api_token_dependencies.py`.
- Refactored `test_auth_service.py` to maintain consistent parameter formatting.
- Cleaned up `test_oauth_service.py` by removing unnecessary imports.
- Improved `test_socket_service.py` with consistent formatting and readability.
- Enhanced `test_cookies.py` by ensuring consistent formatting and readability.
- Introduced new tests for token utilities in `test_token_utils.py` to validate token generation and expiration logic.

app/utils/cookies.py

@@ -1,6 +1,5 @@
 """Cookie parsing utilities for WebSocket authentication."""
 
-from typing import Optional
 
 
 def parse_cookies(cookie_header: str) -> dict[str, str]:
@@ -18,7 +17,7 @@ def parse_cookies(cookie_header: str) -> dict[str, str]:
     return cookies
 
 
-def extract_access_token_from_cookies(cookie_header: str) -> Optional[str]:
+def extract_access_token_from_cookies(cookie_header: str) -> str | None:
     """Extract access token from HTTP cookies."""
     cookies = parse_cookies(cookie_header)
     return cookies.get("access_token")