DeepSeek WebUI Studio (dsh-webui-studio): Develop plugins on real DSH WebUI

DeepSeek WebUI Studio is a visual build workspace for DSH WebUI plugins developed by memorax-ai, designed to isolate the development environment and prevent debug code from contaminating the stable Host. It requires dsh-harmony@0.8.7 and specific Node versions, achieving complete isolation by providing each Draft with an independent Git worktree, DSH_HOME, and Profile. Core features include inspecting DOM, React ownership, and patch traces based on the real official WebUI, using CodeMirror to edit source code and generate CSS decorators, and performing transactional reloading via Harmony to adjust plugin order and Provider state. The tool supports build verification.