feat(platform): add online vehicle statistics detail

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

@@ -198,6 +198,39 @@ test('qualityNotificationPlan reads alert rules and priority issues from backend
   expect(result.priorityIssues[0].notificationText).toContain('告警通知');
 });
 
+test('onlineVehicleStatuses reads paged online vehicle status rows', async () => {
+  const fetchMock = vi.spyOn(globalThis, 'fetch').mockResolvedValue({
+    ok: true,
+    json: async () => ({
+      data: {
+        items: [{
+          vin: 'LB9A32A24R0LS1426',
+          plate: '粤AG18312',
+          phone: '13307795425',
+          oem: 'G7s',
+          protocols: ['JT808', 'GB32960'],
+          online: false,
+          lastSeen: '2026-07-03 20:12:10',
+          offlineDurationMinutes: 18,
+          sourceCount: 2,
+          onlineSourceCount: 0,
+          bindingStatus: 'bound'
+        }],
+        total: 1,
+        limit: 10,
+        offset: 0
+      },
+      traceId: 'trace-test',
+      timestamp: 1783094400000
+    })
+  } as Response);
+
+  const result = await api.onlineVehicleStatuses(new URLSearchParams({ keyword: '粤AG18312', limit: '10' }));
+
+  expect(fetchMock).toHaveBeenCalledWith('/api/statistics/online-vehicles?keyword=%E7%B2%A4AG18312&limit=10', undefined);
+  expect(result.items[0].offlineDurationMinutes).toBe(18);
+});
+
 test('api errors include backend message, detail, and trace id', async () => {
   vi.spyOn(globalThis, 'fetch').mockResolvedValue({
     ok: false,