- Added `api_key` parameter to `SecureChatCompletion` and `send_secure_request`
- Implemented Bearer token authentication in request headers
- Updated test configuration to use API key
- Fixed missing newline at end of `.gitignore`
Add .gitignore file with rules for Python, IDE, test files, build artifacts, virtual environments, OS generated files, editor backups, test coverage, Python tooling, Jupyter, and RSA keypairs to improve repository cleanliness and prevent unwanted files from being committed.
