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/bookings/page.tsx

@@ -3,7 +3,7 @@
 import { useState, useEffect } from 'react';
 import { useLanguage } from '@/context/LanguageContext';
 import { ticketsApi, eventsApi, paymentsApi, Ticket, Event } 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';
@@ -417,7 +417,7 @@ export default function AdminBookingsPage() {
                         <p className="text-xs text-gray-500 truncate max-w-[200px]">{ticket.attendeeEmail || 'N/A'}</p>
                         {ticket.attendeePhone && <p className="text-xs text-gray-400">{ticket.attendeePhone}</p>}
                       </td>
-                      <td className="px-4 py-3 text-sm text-gray-600">{ticket.attendeeRuc || '-'}</td>
+                      <td className="px-4 py-3 text-sm text-gray-600">{formatRucDisplay(ticket.attendeeRuc) || '-'}</td>
                       <td className="px-4 py-3">
                         <span className="text-sm truncate max-w-[150px] block">
                           {ticket.event?.title || events.find(e => e.id === ticket.eventId)?.title || 'Unknown'}