feat(platform): expose active connection capacity

vehicle-data-platform/apps/web/src/api/types.ts

@@ -274,6 +274,7 @@ export interface QualityBucketStat {
 export interface OpsHealth {
   linkHealth: LinkHealth[];
   kafkaLag: number | null;
+  activeConnections: number | null;
   redisOnlineKeys: number | null;
   tdengineWritable: boolean;
   mysqlWritable: boolean;

vehicle-data-platform/apps/web/src/pages/Quality.tsx

@@ -188,8 +188,8 @@ export function Quality({
       </div>
       <Row gutter={16}>
         <Col span={6}><Card bordered title="Kafka Lag">{formatLag(health?.kafkaLag)}</Card></Col>
+        <Col span={6}><Card bordered title="活跃连接">{formatLag(health?.activeConnections)}</Card></Col>
         <Col span={6}><Card bordered title="Redis 在线 Key">{formatLag(health?.redisOnlineKeys)}</Card></Col>
-        <Col span={6}><Card bordered title="BFF 请求超时">{formatRequestTimeout(health)}</Card></Col>
         <Col span={6}>
           <Card bordered title="存储读取">
             <Tag color={statusColor[storageReadStatus(health)] ?? 'grey'}>

vehicle-data-platform/apps/web/src/test/App.test.tsx

@@ -4128,6 +4128,31 @@ test('quality health storage card stays pending before ops health loads', async
   expect(screen.queryByText('异常')).not.toBeInTheDocument();
 });
 
+test('quality health shows active connection capacity metric', async () => {
+  window.history.replaceState(null, '', '/#/quality');
+  vi.spyOn(globalThis, 'fetch').mockImplementation(async (input) => {
+    const path = String(input);
+    return {
+      ok: true,
+      json: async () => ({
+        data: path.includes('/api/ops/health')
+          ? { linkHealth: [], kafkaLag: 0, activeConnections: 120000, redisOnlineKeys: 368, tdengineWritable: true, mysqlWritable: true, runtime: { requestTimeoutMs: 5000 } }
+          : path.includes('/api/quality/summary')
+            ? { issueVehicleCount: 0, issueRecordCount: 0, errorCount: 0, warningCount: 0, protocols: [], issueTypes: [] }
+            : { items: [], total: 0, limit: 20, offset: 0 },
+        traceId: 'trace-test',
+        timestamp: 1783094400000
+      })
+    } as Response;
+  });
+
+  render(<App />);
+
+  expect(await screen.findByRole('heading', { name: '质量治理' })).toBeInTheDocument();
+  expect(await screen.findByText('活跃连接')).toBeInTheDocument();
+  expect(screen.getByText('120,000')).toBeInTheDocument();
+});
+
 test('shows vehicle service evidence chain before source details', async () => {
   window.history.replaceState(null, '', '/#/detail?keyword=VIN001');
   vi.spyOn(globalThis, 'fetch').mockImplementation(async (input) => {