Fix: Add pagination to admin appointments endpoint

- Added pagination with page/per_page query params
- Fixed N+1 query by using eager-loaded user relationship
- Removed unused _get_user_email helper function
- Updated frontend to handle paginated response
- Regenerated API types

frontend/app/admin/appointments/page.tsx

@@ -9,6 +9,7 @@ import { useRequireAuth } from "../../hooks/useRequireAuth";
 import { components } from "../../generated/api";
 
 type AppointmentResponse = components["schemas"]["AppointmentResponse"];
+type PaginatedAppointments = components["schemas"]["PaginatedResponse_AppointmentResponse_"];
 
 // Helper to format datetime
 function formatDateTime(isoString: string): string {
@@ -200,8 +201,9 @@ export default function AdminAppointmentsPage() {
 
   const fetchAppointments = useCallback(async () => {
     try {
-      const data = await api.get<AppointmentResponse[]>("/api/admin/appointments");
-      setAppointments(data);
+      // Fetch with large per_page to get all appointments for now
+      const data = await api.get<PaginatedAppointments>("/api/admin/appointments?per_page=100");
+      setAppointments(data.records);
     } catch (err) {
       console.error("Failed to fetch appointments:", err);
       setError("Failed to load appointments");