dsh-video-skin: DeepSeek Harness Video Skin Plugin

The DeepSeek Harness plugin `dsh-video-skin` offers video backgrounds and audio-enabled startup animations. Designed with zero dependencies, it allows users to customize the interface by adjusting transparency and contrast. The plugin supports real-time adjustment of the background overlay, skipping the startup animation, and theme adaptation. To install it, paste the specified command via the plugin management interface and fully restart the software to apply changes. Configuration files are stored in a local directory, and keyboard shortcuts are supported.