fix(dashboard): align camera status field with backend API response

frontend/src/pages/Dashboard.tsx

@@ -64,7 +64,8 @@ const Dashboard: React.FC = () => {
       const res = await axios.get('/api/pipeline/status');
       const cameras = Object.entries(res.data.cameras || {}).map(([id, info]) => ({
         id,
-        ...info as any,
+        is_running: (info as any).is_running || false,
+        fps: (info as any).fps || 0,
       }));
       setCameraStatus(cameras);
     } catch (err) {
@@ -163,8 +164,8 @@ const Dashboard: React.FC = () => {
                     title={`摄像头 ${cam.id}`}
                     description={
                       <Space>
-                        <Tag color={cam.running ? 'green' : 'red'}>
-                          {cam.running ? '运行中' : '已停止'}
+                        <Tag color={cam.is_running ? 'green' : 'red'}>
+                          {cam.is_running ? '运行中' : '已停止'}
                         </Tag>
                         <span>{cam.fps?.toFixed(1) || 0} FPS</span>
                       </Space>