perf(web): gate alert workspace queries

vehicle-data-platform/apps/web/src/v2/pages/AlertsPage.test.tsx

@@ -35,3 +35,30 @@ test('preserves an unsubmitted event filter draft across alert tab URL changes',
 
   expect(await screen.findByPlaceholderText('车牌 / VIN / 规则名称')).toHaveValue('保留筛选草稿');
 });
+
+test('loads only event dependencies on the default alert tab', async () => {
+  mocks.alertSummaryV2.mockResolvedValue({ active: 0, unprocessed: 0, processing: 0, recovered: 0, closed: 0, ignored: 0, unreadNotifications: 0, asOf: '' });
+  mocks.alertEventsV2.mockResolvedValue({ items: [], total: 0, limit: 20, offset: 0 });
+  mocks.alertRulesV2.mockResolvedValue([]);
+  mocks.alertNotificationsV2.mockResolvedValue({ items: [], total: 0, limit: 100, offset: 0 });
+  const client = new QueryClient({ defaultOptions: { queries: { retry: false } } });
+  render(<QueryClientProvider client={client}><MemoryRouter future={ROUTER_FUTURE} initialEntries={['/alerts']}><AlertsPage /></MemoryRouter></QueryClientProvider>);
+
+  await screen.findByText('当前筛选条件没有告警事件');
+  expect(mocks.alertRulesV2).toHaveBeenCalledTimes(1);
+  expect(mocks.metricCatalog).not.toHaveBeenCalled();
+  expect(mocks.alertNotificationsV2).toHaveBeenCalledTimes(1);
+  expect(mocks.alertNotificationsV2.mock.calls[0][0].toString()).toBe('unreadOnly=true&limit=100');
+});
+
+test('loads one full notification query on a direct notifications entry', async () => {
+  mocks.alertNotificationsV2.mockResolvedValue({ items: [], total: 0, limit: 100, offset: 0 });
+  const client = new QueryClient({ defaultOptions: { queries: { retry: false } } });
+  render(<QueryClientProvider client={client}><MemoryRouter future={ROUTER_FUTURE} initialEntries={['/alerts?tab=notifications']}><AlertsPage /></MemoryRouter></QueryClientProvider>);
+
+  await screen.findByText('仅站内通道具备真实送达与已读状态');
+  expect(mocks.alertRulesV2).not.toHaveBeenCalled();
+  expect(mocks.metricCatalog).not.toHaveBeenCalled();
+  expect(mocks.alertNotificationsV2).toHaveBeenCalledTimes(1);
+  expect(mocks.alertNotificationsV2.mock.calls[0][0].toString()).toBe('limit=100');
+});