fix: accept MBE 'healthy' status and show model info

- Updated testMbe() to accept status='healthy' from MarkBaseServer
- Added model and layers info to mbeInfo display
- MBE now shows 'MBE (e4b)' instead of generic 'MarkBaseEngine'

src/views/AdminView.vue

@@ -892,10 +892,12 @@ async function testMbe() {
     if (contentType.includes('application/json')) {
       // JSON 格式响应
       const json = await resp.json()
-      isHealthy = json.status === 'ok' || json.status === 'OK'
+      isHealthy = json.status === 'ok' || json.status === 'OK' || json.status === 'healthy'
       mbeInfo.value = {
-        version: json.version || 'MarkBaseEngine',
-        uptime: json.uptime || 0
+        version: json.model ? `MBE (${json.model})` : 'MarkBaseEngine',
+        uptime: json.uptime || 0,
+        model: json.model || null,
+        layers: json.layers || null
       }
     } else {
       // 纯文本格式响应