feat(platform): return service status in vehicle overview

vehicle-data-platform/apps/web/src/api/client.test.ts

@@ -83,7 +83,15 @@ test('vehicleServiceOverview sends keyword to the lightweight overview endpoint'
         historyCount: 0,
         rawCount: 0,
         mileageCount: 0,
-        qualityIssueCount: 0
+        qualityIssueCount: 0,
+        serviceStatus: {
+          status: 'degraded',
+          severity: 'warning',
+          title: '部分来源离线',
+          detail: '1/2 个来源在线',
+          sourceCount: 2,
+          onlineSourceCount: 1
+        }
       },
       traceId: 'trace-test',
       timestamp: 1783094400000
@@ -94,6 +102,7 @@ test('vehicleServiceOverview sends keyword to the lightweight overview endpoint'
 
   expect(fetchMock).toHaveBeenCalledWith('/api/vehicle-service/overview?keyword=%E7%B2%A4AG18312', undefined);
   expect(result.coverageStatus).toBe('partial');
+  expect(result.serviceStatus?.status).toBe('degraded');
 });
 
 test('api errors include backend message, detail, and trace id', async () => {