dsh-music-player: Audius Music Player Plugin for DeepSeek Harness

`dsh-music-player` is the official music player plugin for DeepSeek Harness, allowing users to search for and stream music from the Audius platform within the Web interface. It provides a sidebar panel, a mini playback bar, popular charts, and local favorites, and supports natural-language remote control through an Agent. Built using DSH's official mechanisms, the plugin relies on the browser remaining open for audio playback and automatically skips songs that fail to play.