Add dark workbench dashboard with host CPU/memory gauges.

Sample Windows CPU via Processor Utility so values match Task Manager, and expose host metrics on /v1/metrics/json for the workbench poll.

Co-authored-by: Cursor <cursoragent@cursor.com>

web/vite.config.ts

@@ -14,6 +14,10 @@ export default defineConfig({
         // Keep Origin aligned with upstream for WS handshake through proxy.
         rewriteWsOrigin: true,
       },
+      "/metrics": {
+        target: "http://127.0.0.1:8890",
+        changeOrigin: true,
+      },
     },
   },
 })