feat: add dashboard overview health summary

atsf_server/web/features/dashboard/api/overview.ts

@@ -0,0 +1,7 @@
+import { apiRequest } from '@/lib/api/client';
+
+import type { DashboardOverview } from '@/features/dashboard/types';
+
+export function getDashboardOverview() {
+  return apiRequest<DashboardOverview>('/dashboard/overview');
+}