Add PostgreSQL support with SQLite/Postgres database compatibility layer

- Add dbGet/dbAll helper functions for database-agnostic queries
- Add toDbBool/convertBooleansForDb for boolean type conversion
- Add toDbDate/getNow for timestamp type handling
- Add generateId that returns UUID for Postgres, nanoid for SQLite
- Update all routes to use compatibility helpers
- Add normalizeEvent to return clean number types from Postgres decimal
- Add formatPrice utility for consistent price display
- Add legal pages admin interface with RichTextEditor
- Update carousel images
- Add drizzle migration files for PostgreSQL

frontend/src/app/(public)/book/[eventId]/page.tsx

@@ -6,6 +6,7 @@ import Link from 'next/link';
 import { useLanguage } from '@/context/LanguageContext';
 import { useAuth } from '@/context/AuthContext';
 import { eventsApi, ticketsApi, paymentOptionsApi, Event, PaymentOptionsConfig } from '@/lib/api';
+import { formatPrice } from '@/lib/utils';
 import Card from '@/components/ui/Card';
 import Button from '@/components/ui/Button';
 import Input from '@/components/ui/Input';
@@ -620,7 +621,7 @@ export default function BookingPage() {
                 {locale === 'es' ? 'Monto a pagar' : 'Amount to pay'}
               </p>
               <p className="text-2xl font-bold text-primary-dark">
-                {event?.price?.toLocaleString()} {event?.currency}
+                {event?.price !== undefined ? formatPrice(event.price, event.currency) : ''}
               </p>
             </div>
             
@@ -924,7 +925,7 @@ export default function BookingPage() {
               <span className="font-bold text-lg">
                 {event.price === 0 
                   ? t('events.details.free')
-                  : `${event.price.toLocaleString()} ${event.currency}`}
+                  : formatPrice(event.price, event.currency)}
               </span>
             </div>
           </div>