Upgrade DeepSeek Harness Web Edition into an all-in-one development environment with dsh-IDE

dsh-IDE is maintained by chenw2759-wq, which turns DeepSeek Harness Web GUI into a JupyterLab-style workspace: featuring a file tree, syntax-highlighted editing, built-in terminal, Tree-style red-green diff, as well as Markdown/Office preview and visual editing. In SSH mode, the model remains running locally, while files and commands are executed remotely. It is licensed under BSD-3-Clause. The directory installation command is `dsh plugin add github:chenw2759-wq/dsh-IDE`; the repository README requires installing three packages separately into the web profile after cloning.