- Added configuration options for URL shortening in `config.ini.example` and updated documentation in `FEEDS.md`.
- Enhanced `FeedManager` to support URL shortening based on new settings, allowing for both global and per-link shortening.
- Refactored message formatting logic to incorporate URL shortening features, ensuring compatibility with existing link handling.
- Introduced new utility functions for encoding path length bytes in `utils.py`, improving path management in message handling.
- Added unit tests to validate the new URL shortening functionality and ensure proper behavior under various conditions.
