dsh-we-wallpaper: Integrating Wallpaper Engine's Wallpaper Library into DSH Web GUI

`dsh-we-wallpaper` is a plugin that enables the DeepSeek Harness (DSH) Web GUI to use Wallpaper Engine wallpapers. It supports video, Web, image, and scene wallpapers, and provides features such as a dark overlay, sharpening control, and cache optimization. Scene wallpapers loop smoothly once the first high-resolution cache is generated, ensuring a fluid interactive experience. The plugin requires a Windows environment, is easy to install and resource-friendly, and gives DSH users highly personalized background customization capabilities.