feat(platform): enhance mileage statistics workspace

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

@@ -3440,6 +3440,78 @@ test('shows mileage anomaly action guidance', async () => {
   expect(screen.getByText('日里程异常，优先核对当天首末总里程、来源断链和补传数据。')).toBeInTheDocument();
 });
 
+test('shows mileage statistics workspace with trend source and definition', async () => {
+  window.history.replaceState(null, '', '/#/mileage?keyword=VIN-MILEAGE-STATS');
+  vi.spyOn(globalThis, 'fetch').mockImplementation(async (input) => {
+    const path = String(input);
+    if (path.includes('/api/ops/health')) {
+      return {
+        ok: true,
+        json: async () => ({
+          data: { linkHealth: [], kafkaLag: 0, redisOnlineKeys: 0, tdengineWritable: true, mysqlWritable: true, runtime: { requestTimeoutMs: 5000 } },
+          traceId: 'trace-test',
+          timestamp: 1783094400000
+        })
+      } as Response;
+    }
+    if (path.includes('/api/mileage/summary')) {
+      return {
+        ok: true,
+        json: async () => ({
+          data: { vehicleCount: 2, recordCount: 4, sourceCount: 2, totalMileageKm: 140, averageMileagePerVin: 70 },
+          traceId: 'trace-test',
+          timestamp: 1783094400000
+        })
+      } as Response;
+    }
+    if (path.includes('/api/mileage/daily')) {
+      return {
+        ok: true,
+        json: async () => ({
+          data: {
+            items: [
+              { vin: 'VIN-MILEAGE-STATS', plate: '粤A统计1', source: 'JT808', date: '2026-07-01', startMileageKm: 100, endMileageKm: 140, dailyMileageKm: 40, anomalySeverity: '' },
+              { vin: 'VIN-MILEAGE-STATS', plate: '粤A统计1', source: 'GB32960', date: '2026-07-01', startMileageKm: 200, endMileageKm: 230, dailyMileageKm: 30, anomalySeverity: '' },
+              { vin: 'VIN-MILEAGE-STATS-2', plate: '粤A统计2', source: 'JT808', date: '2026-07-02', startMileageKm: 300, endMileageKm: 360, dailyMileageKm: 60, anomalySeverity: 'warning' },
+              { vin: 'VIN-MILEAGE-STATS-2', plate: '粤A统计2', source: 'GB32960', date: '2026-07-02', startMileageKm: 400, endMileageKm: 410, dailyMileageKm: 10, anomalySeverity: '' }
+            ],
+            total: 4,
+            limit: 20,
+            offset: 0
+          },
+          traceId: 'trace-test',
+          timestamp: 1783094400000
+        })
+      } as Response;
+    }
+    return {
+      ok: true,
+      json: async () => ({
+        data: { items: [], total: 0, limit: 20, offset: 0 },
+        traceId: 'trace-test',
+        timestamp: 1783094400000
+      })
+    } as Response;
+  });
+
+  render(<App />);
+
+  expect(await screen.findByText('区间趋势')).toBeInTheDocument();
+  expect(screen.getByText('来源贡献')).toBeInTheDocument();
+  expect(screen.getAllByText('2026-07-01').length).toBeGreaterThanOrEqual(1);
+  expect(screen.getAllByText('2026-07-02').length).toBeGreaterThanOrEqual(1);
+  expect(screen.getAllByText('JT808').length).toBeGreaterThanOrEqual(1);
+  expect(screen.getAllByText('GB32960').length).toBeGreaterThanOrEqual(1);
+  expect(screen.getByText('当前页里程')).toBeInTheDocument();
+  expect(screen.getByText('140 km')).toBeInTheDocument();
+  expect(screen.getByText('异常记录')).toBeInTheDocument();
+  expect(screen.getAllByText('1').length).toBeGreaterThanOrEqual(1);
+  expect(screen.getByText('最大单日')).toBeInTheDocument();
+  expect(screen.getByText('60 km')).toBeInTheDocument();
+  expect(screen.getByText('统计口径')).toBeInTheDocument();
+  expect(screen.getByText((content) => content.includes('区间总值应等于各日里程之和'))).toBeInTheDocument();
+});
+
 test('opens vehicle service from history results with row source evidence', async () => {
   window.history.replaceState(null, '', '/#/history?keyword=%E7%B2%A4AG18312&protocol=JT808');
   vi.spyOn(globalThis, 'fetch').mockImplementation(async (input, init) => {