dsh-ui-liteglass: DeepSeek Harness Lightweight Glassmorphism Skin

LiteGlass is a plugin that provides lightweight visual personalization for DeepSeek Harness. Built on the official APIs, it addresses the limited styling of the native interface. The plugin supports custom wallpapers (remote or local), panel opacity adjustment, and accent color settings, with server-side persistence enabled so the appearance can stay synchronized across multiple devices. It has a clean design without relying on additional CSS frameworks, is compatible with the DSH 0.1.0-rc series, and can be installed and enabled using the `dsh plugin` command.