Enterprise Gitea & Forgejo integration for DeepSeek Harness: 20+ issue/PR/worktree tools and a real-time Git status chip in chat.

开放的侧边栏底座，支持三方拓展注册新侧边栏页面。内置文件渲染编辑/终端/侧边对话/Git/子代理页面 ｜ Open sidebar foundation, supports third-party extensions to register new sidebar pages. Built-in file rendering/editing, terminal, side chat, Git, and sub-agent pages.