- Add Settings class using pydantic-settings
- Load config from environment variables with GM_ prefix
- Support encrypt_key and api_token (required, no defaults for security)
- Provide defaults for data_dir, host, port
- Add computed properties for db_path, ssh_keys_dir, repos_dir
- Add tests for config defaults and environment variable overrides
- Add Base class to app.models to unblock conftest.py imports
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
