dock-media: A Streaming Media Playback Plugin for DSH Dock

`dock-media` is a client-side plugin in the DSH ecosystem, designed for secure and efficient playback of local media files in a web environment. It uses HTTP Range requests to enable streaming, avoiding the memory usage associated with converting large files to Base64. It supports dual-mode audio and video playback with full playback controls, metadata probing, and format fallback handling. The plugin depends on `dock` and `dock-files` and provides a read-only service via the `/dock-media` route, ensuring strong performance and security.