dsh-plugin-store: Install and manage dsh-plugin ecosystem plugins within the DSH plugin page

dsh-plugin-store is the plugin store for DeepSeek Harness, designed to centralize the management of DSH plugins that are scattered across GitHub. Integrated into the "Settings → Plugins" page of DSH, this tool offers features for browsing plugins, real-time searching, multidimensional filtering (such as by category, tag, and author), and sorting. Its core capabilities include one-click installation, uninstallation, and update detection. It supports automatically handling dependencies and writing them to the profile bundle via `pnpm add`, while also allowing manual installation of packages or subdirectories with specific formats. Installation, uninstallation, and update operations only modify the configuration, requiring a restart of DSH to take effect. The tool supports configuring a `GITHUB_TOKEN` to enhance API rate limits and performs update detection based on the `pushed_at` field. It is suitable for users who need to frequently manage plugins.