dsh-scenery: Capy-Style Environment Background for DeepSeek Harness

dsh-scenery is an ambient background plugin designed for DeepSeek Harness (DSH). It uses a visual overlay approach, combining a selected background image, a bottom black gradient, and editor glow to add an ambient atmosphere to a plain workspace without altering the original UI layout. The plugin supports local uploads or URL-based wallpapers, offers adjustable parameters such as scale, position, blur, and transparency, and includes real-time preview and one-click reset. All configurations and wallpapers are persistently saved. As a low-intrusion tool, it is suitable for users who want to enhance immersion while preserving the native interaction experience.