feat: add manual OAuth authentication and persistent server functionality

- Introduced 'auth-code' command for manual authentication using an authorization code.
- Implemented 'server' command to start a persistent HTTP server for handling OAuth callbacks and export requests.
- Enhanced error handling and user feedback for authentication processes.
- Added new endpoints for status checks, health checks, and export functionalities.

This update significantly improves the OAuth authentication experience and provides a robust server for managing exports.

Author: JohanDevl