dshmarketplace-plugin: Browse and Install Plugins Within DSH

dshmarketplace-plugin is a DSH plugin maintained by DshMarketPlace, licensed under the MIT License. It is designed to allow users to search for plugins, view their descriptions, and install them—all within the DSH session without leaving it. The plugin supports both English and Chinese and follows DSH's language settings for display. Its core features include the `/store` command and a settings page entry for performing in-session marketplace operations, as well as the `dshmarketplace_search` and `dshmarketplace_install` tools, which enable Agents to automatically search for and install plugins during conversations. To ensure security, plugins must pass installation tests before being listed, installation commands are rigorously validated to reject illegal input, and the browser side is isolated from the Shell. Regarding privacy