Normalize RUC formatting to base-checkdigit across booking and admin views.

Accept dashed or digits-only RUC input on the backend, store a canonical dashed form, and display it consistently in booking and admin UIs.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/app/admin/payments/page.tsx

@@ -3,7 +3,7 @@
 import { useState, useEffect } from 'react';
 import { useLanguage } from '@/context/LanguageContext';
 import { paymentsApi, adminApi, eventsApi, PaymentWithDetails, Event, ExportedPayment, FinancialSummary } from '@/lib/api';
-import { parseDate } from '@/lib/utils';
+import { parseDate, formatRucDisplay } from '@/lib/utils';
 import Card from '@/components/ui/Card';
 import Button from '@/components/ui/Button';
 import { AdminPageSkeleton } from '@/components/ui/Skeleton';
@@ -205,7 +205,7 @@ export default function AdminPaymentsPage() {
       p.createdAt,
       `${p.attendeeFirstName} ${p.attendeeLastName || ''}`.trim(),
       p.attendeeEmail || '',
-      p.attendeeRuc || '',
+      formatRucDisplay(p.attendeeRuc) || '',
       p.eventTitle,
       p.eventDate,
     ]);
@@ -431,7 +431,7 @@ export default function AdminPaymentsPage() {
                     <p className="text-sm text-gray-600">{selectedPayment.ticket.attendeePhone}</p>
                   )}
                   {selectedPayment.ticket.attendeeRuc && (
-                    <p className="text-sm text-gray-600">RUC: {selectedPayment.ticket.attendeeRuc}</p>
+                    <p className="text-sm text-gray-600">RUC: {formatRucDisplay(selectedPayment.ticket.attendeeRuc)}</p>
                   )}
                 </div>
               )}