DSH Plugin Introduction: dsh-soln-panel (Right-side Solution Panel in the Chat)

`dsh-soln-panel` is a DeepSeek Harness plugin designed to provide an interactive HTML solution panel on the right side of the conversation. It supports multi-tab switching, draggable width, unread indicators, and workspace-persistent storage, enabling the polished display of structured content such as code and tables. Users can invoke it through the `show_solution` tool to append, update, or clear solutions. Lightweight and build-free, the plugin strictly isolates data across different workspaces, significantly improving the usability of content management.