dsh-ui-workbench: DSH WebUI Workspace Files and Git Review Panel

dsh-ui-workbench is an experimental WebUI plugin for DeepSeek Harness, designed to enhance workspace review capabilities within Web session pages. The plugin provides an integrated panel on the right side of the session page. Its core features include a file tree and file viewer with line numbers, syntax highlighting, and search functionality; Git status and diff review supporting unified and side-by-side views (covering staged, unstaged, untracked files, and commit references); and a real-time SVG preview based on Typst. The plugin supports both Chinese and English, as well as light and dark themes, and includes built-in optimized fonts to enhance the reading experience. Positioned as a lightweight review tool, it does not perform Git commits, credential storage, or general file editing. It accesses the current session workspace via Host-side API routing and Browser-side panels, ensuring clear code boundaries.