DeepSeek Harness Music Download Plugin: Search, Download, and Lyrics Processing

The `dsh-song-download` plugin for DeepSeek Harness (DSH) is an MIT-licensed open-source tool designed to enable cross-platform music resource downloading and conversion within agents. It depends on `yt-dlp` and `ffmpeg`, supports searching for songs on Bilibili or YouTube, automatically transcodes audio to 320k MP3 format, and extracts or fetches missing LRC lyrics. After installation, users can operate it directly with natural-language commands (e.g., "Download Jay Chou's Sunny Day") or batch-download links. The installation command is `dsh plugin --profile main add dsh-song-download`, effective after restarting the service. Users should be mindful of copyright issues and ensure runtime permissions.