fix: MBE health check proxy and admin page

- Added /api/v1/mbe/health proxy endpoint
- Frontend uses proxy for MBE health check (works on localhost and external)
- Accepts 'healthy' status from MBE response
- Shows model info (MBE e4b) in Admin UI

node_modules/.vite/deps/vue-router.js

@@ -20,6 +20,7 @@ import {
   watch,
   watchEffect
 } from "./chunk-5G6OTI3J.js";
+import "./chunk-RR3RQRRX.js";
 
 // node_modules/vue-router/dist/devtools-EWN81iOl.mjs
 var isBrowser = typeof document !== "undefined";