fix: resolve 48 lint errors in test files

- Remove whitespace from 22 blank lines (W293)
- Remove 6 unused imports (F401): os, Mock, MagicMock, Path
- Add missing imports for 12 test functions (F821): sanitize_filename, extract_remote_path, MagicMock
- Fix 1 unsorted import block (I001)

All ruff checks now pass successfully.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_api_openai.py

@@ -129,7 +129,7 @@ class TestOpenAIConnectionErrors:
     def test_openai_unexpected_exception(self, mock_settings, mock_openai_class, client):
         """Test handling of unexpected exceptions."""
         mock_settings.openai_api_key = "sk-test-key"
-        
+
         # Raise an unexpected exception during OpenAI client creation
         mock_openai_class.side_effect = RuntimeError("Unexpected error")