- Remove TestEnvironment struct and return TempDir from setup function
- Update tests to compute paths from temp_dir.path() on-demand
- Eliminate unused field warnings and reduce code complexity
- Maintain all test functionality with cleaner design
- Create shared tests/common.rs with TestEnvironment setup
- Simplify gemini_test_client.py to single-request client
- Refactor config validation tests to use common setup
- Add test_valid_config_startup for complete server validation
- Fix clippy warning in main.rs
- Remove unused code and consolidate test infrastructure
