dsh-3d-plugin-graph: Visualize DSH plugin runtime as a real-time 3D graph

`jelly-000/dsh-3d-plugin-graph` is a web-based plugin within the DSH ecosystem designed to visualize plugin topology. It reads real-time data from Cordis runtime and renders nodes, tool activities, and connection states as a rotatable, zoomable, and draggable 3D graph, automatically falling back to an offline demo mode when data is unavailable. Beyond monitoring, this plugin supports securely enabling or disabling plugins, featuring built-in double confirmation and server-side guard mechanisms to prevent the accidental deletion of core components. Technically, it utilizes a single-file UI with zero external dependencies, incorporates security measures such as Content Security Policy (CSP) and XSS protection, and supports accessibility and reduced motion preferences. During a load test with 170 nodes, the average frame interval was approximately 17ms, demonstrating good performance. Installation requires adding the plugin via the `dsh plugin` command and restarting the Web service.