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/admin/layout.tsx

@@ -23,6 +23,7 @@ import {
   XMarkIcon,
   BanknotesIcon,
   QrCodeIcon,
+  DocumentTextIcon,
 } from '@heroicons/react/24/outline';
 import clsx from 'clsx';
 import { useState } from 'react';
@@ -67,6 +68,7 @@ export default function AdminLayout({
     { name: t('admin.nav.contacts'), href: '/admin/contacts', icon: EnvelopeIcon },
     { name: t('admin.nav.emails'), href: '/admin/emails', icon: InboxIcon },
     { name: t('admin.nav.gallery'), href: '/admin/gallery', icon: PhotoIcon },
+    { name: locale === 'es' ? 'Páginas Legales' : 'Legal Pages', href: '/admin/legal-pages', icon: DocumentTextIcon },
     { name: locale === 'es' ? 'Configuración' : 'Settings', href: '/admin/settings', icon: Cog6ToothIcon },
   ];