fix: apply isort formatting to fix CI linting

Applied isort to properly sort all imports according to PEP8:
- Standard library imports first
- Third-party imports second
- Local imports last
- Alphabetical ordering within each group

All tests still passing after import reordering.

gemini_server.py

@@ -4,8 +4,9 @@ This file exists to maintain compatibility with existing configurations.
 The main implementation is now in server.py
 """
 
-from server import main
 import asyncio
 
+from server import main
+
 if __name__ == "__main__":
     asyncio.run(main())