fix(platform): avoid fake kafka lag

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

@@ -4,6 +4,10 @@ import { api } from '../api/client';
 import type { OpsHealth, QualityIssueRow } from '../api/types';
 import { PageHeader } from '../components/PageHeader';
 
+function formatLag(value?: number | null) {
+  return value == null ? '未接入' : value.toLocaleString();
+}
+
 export function Quality() {
   const [issues, setIssues] = useState<QualityIssueRow[]>([]);
   const [health, setHealth] = useState<OpsHealth | null>(null);
@@ -36,7 +40,7 @@ export function Quality() {
     <div className="vp-page">
       <PageHeader title="数据质量" description="断链、VIN 缺失、字段缺失和链路健康的排查入口" />
       <Row gutter={16}>
-        <Col span={8}><Card bordered title="Kafka Lag">{health?.kafkaLag ?? 0}</Card></Col>
+        <Col span={8}><Card bordered title="Kafka Lag">{formatLag(health?.kafkaLag)}</Card></Col>
         <Col span={8}><Card bordered title="Redis 在线 Key">{health?.redisOnlineKeys ?? 0}</Card></Col>
         <Col span={8}><Card bordered title="存储写入">{health?.tdengineWritable && health.mysqlWritable ? '正常' : '异常'}</Card></Col>
       </Row>