fix: render metrics and smooth route transitions

frontend/src/admin/pages/LiveBoard.tsx

@@ -62,12 +62,16 @@ export default function LiveBoard() {
       message.error('看板数据加载失败')
     } finally {
       try {
-        const [metrics, nodeResponse] = await Promise.all([getSystemMetrics(), api.get<NodeMetric[]>('/nodes')])
-        setSystemMetrics(metrics)
-        setNodes(nodeResponse.data)
+        setSystemMetrics(await getSystemMetrics())
       } catch {
         setSystemMetrics(null)
       }
+      try {
+        const nodeResponse = await api.get<NodeMetric[]>('/nodes')
+        setNodes(nodeResponse.data)
+      } catch {
+        setNodes([])
+      }
       setLoading(false)
     }
   }
@@ -176,4 +180,4 @@ export default function LiveBoard() {
       </Space>
     </div>
   )
-}
+}