fix: optimize MBE start flow - skip redundant frontend polling

- Backend already polls 60s for MBE port readiness
- Frontend no longer polls 30s after backend returns
- Total wait time: ~60s instead of ~90s
- Start timeout set to 60s for MBE

src/views/AdminView.vue

@@ -761,6 +761,8 @@ async function startService(name: string) {
     const started = typeof result === 'string' ? result === 'started' : result?.result === 'started'
     s.result.value = started ? (name === 'mbe' ? 'Loading model...' : 'Service started') : JSON.stringify(result)
     s.ok.value = started
+    // For MBE, backend already polls for 60s, just test once
+    if (name !== 'mbe') {
       // Poll up to 30s for the service to pass health check
       for (let i = 0; i < 15; i++) {
         await new Promise(r => setTimeout(r, 2000))
@@ -770,6 +772,13 @@ async function startService(name: string) {
           break
         }
       }
+    } else {
+      // MBE: test once after backend returns
+      await s.test()
+      if (s.status.value === 'online') {
+        s.result.value = 'Service started'
+      }
+    }
   } catch (e: any) {
     s.result.value = 'Error: ' + (e.message || e)
     s.ok.value = false