dsh-client-plugin-store: Community Plugin Store Panel for DeepSeek Harness Web UI

`dsh-client-plugin-store` is a community plugin store panel for DeepSeek Harness. It allows users to access and manage 4,000+ plugins on dshplugin.org directly from Web UI settings. The plugin supports sorting by stars, searching, copying pinned-commit install commands, and installing or uninstalling plugins with double-click confirmation. Technically, it proxies directory data on the Host side with three-layer security protection, registers an independent partition on the browser side, and uses CSS tokens to adapt to themes. After installing this plugin, users need to restart `dsh --profile web` to use it.