Interactive in-browser canvas for real-time preview of HTML, React components, SVGs, and diagrams with SSE hot-reload

DSH 桌面端自己的刷新按钮：改插件不用重启、开久了卡了也点一下，正在进行的会话不受影响。

Your agent finally sees the UI it builds. Compose Previews in your browser, redrawn a second after every save — no Android Studio, no build.

Enables AI clients and CLI users to query and modify multiple MySQL data sources routed by project and environment, with explicit environment binding, server-side read-only enforcement, hot-reloaded web configuration, and SQL execution auditing.