feat(platform): return service status in vehicle overview

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

@@ -100,7 +100,15 @@ test('shows resolved vehicle service status after topbar search', async () => {
             historyCount: 0,
             rawCount: 0,
             mileageCount: 0,
-            qualityIssueCount: 0
+            qualityIssueCount: 0,
+            serviceStatus: {
+              status: 'degraded',
+              severity: 'warning',
+              title: '后端判定部分离线',
+              detail: '后端统一车辆服务状态',
+              sourceCount: 2,
+              onlineSourceCount: 1
+            }
           },
           traceId: 'trace-test',
           timestamp: 1783094400000
@@ -143,7 +151,7 @@ test('shows resolved vehicle service status after topbar search', async () => {
   fireEvent.change(screen.getByPlaceholderText('搜索 VIN / 车牌 / 手机号'), { target: { value: '粤AG18312' } });
   fireEvent.click(screen.getByRole('button', { name: '查询车辆' }));
 
-  expect(await screen.findByText('当前车辆：部分来源离线')).toBeInTheDocument();
+  expect(await screen.findByText('当前车辆：后端判定部分离线')).toBeInTheDocument();
   expect(screen.getByText('粤AG18312 / LB9A32A24R0LS1426')).toBeInTheDocument();
   expect(fetchMock).toHaveBeenCalledWith(expect.stringContaining('/api/vehicle-service/overview?keyword=%E7%B2%A4AG18312'), undefined);
   expect(fetchMock).not.toHaveBeenCalledWith(expect.stringContaining('/api/vehicles/resolve'), undefined);