Release v0.7.1

Bug fixes and improvements for release management

- Fixed Codeberg release creation issues with certain repositories
- Improved error handling for Gitea API "Release is has no Tag" error
- Fixed token loading from ~/.gitsyncer_codeberg_token file

- AI release notes are now enabled by default (use --no-ai-notes to disable)
- Added debug output for token loading in release management
- Better error messages when Codeberg/Gitea API returns errors
- Graceful handling of repository-specific API limitations

- Codeberg tokens are properly loaded from ~/.gitsyncer_codeberg_token
- Some old tags on Codeberg/Gitea may not support release creation via API