dsh-plain-plugin-menu: Manage DeepSeek Harness plugins in plain language

`dsh-plain-plugin-menu` is a DSH community plugin developed by 4mForAI, designed to address issues such as cryptic plugin names, unclear categorization, and cumbersome management. Integrated via the `sidebar.footer.action` entry at the bottom of the left sidebar in the DSH Web UI, this plugin does not replace the official sidebar but provides "plain Chinese" categorization and search functionalities. Its core capabilities include fetching the community plugin list online (with an offline snapshot containing 824 entries), displaying public metrics such as GitHub Stars, maintenance duration, and License, and supporting multi-dimensional search and sorting. Users can directly invoke the `dsh plugin` command within the Web interface to install and uninstall plugins, and check the runtime status of dependencies for the current profile. It supports switching between Chinese and English, and when the network fails...