dsh-mobile-glass: DSH Web Mobile Adaptation Plugin

`dsh-mobile-glass` is a mobile adaptation plugin for DeepSeek Harness (DSH), designed to address layout misalignment on narrow screens. By overriding the DOM and CSS, it implements a floating glass menu at the top, Reveal drawer interactions, adaptive input fields, and gesture-based sliding on screens ≤1023px wide, while cleaning up the header area and supporting PWA. The plugin has zero impact on desktop and takes effect automatically after installation, making it suitable for developers seeking a native-like experience. Note that drag operations on physical devices may occasionally exhibit jitter, and the Service Worker must be manually cleared after uninstallation.