dsh-workspace-sidebar: DSH Web Right Workspace Sidebar

`dsh-workspace-sidebar` is a right-side workspace sidebar plugin for DSH Web sessions, designed to handle code processing without switching to an external IDE. Its core features include supporting lazy-loaded file tree browsing (including view, rename, delete, and Markdown and code highlighting previews), displaying a Git diff file list (M/D/U status) and specific Diff content, showing commit history via `git log --graph` and supporting the viewing of file changes for a single commit, and quickly referencing a file's relative path to an input box via hovering and clicking the "@" button. The plugin offers installation via GitHub and npm, and requires restarting the `dsh web` service to take effect. Please note that the plugin's file write operations (delete, rename) and Git operations...