Add photo galleries API and frontend for public and admin viewing.

Introduces the Go photo-api service, nginx/systemd deploy wiring, and Next.js gallery/lightbox pages so event photos can be managed and browsed.

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

frontend/src/app/admin/layout.tsx

@@ -17,6 +17,7 @@ import {
   EnvelopeIcon,
   InboxIcon,
   PhotoIcon,
+  CameraIcon,
   Cog6ToothIcon,
   ArrowLeftOnRectangleIcon,
   Bars3Icon,
@@ -54,6 +55,7 @@ export default function AdminLayout({
     { name: t('admin.nav.contacts'), href: '/admin/contacts', icon: EnvelopeIcon, allowedRoles: ['admin', 'organizer', 'marketing'] },
     { name: t('admin.nav.emails'), href: '/admin/emails', icon: InboxIcon, allowedRoles: ['admin', 'organizer'] },
     { name: t('admin.nav.gallery'), href: '/admin/gallery', icon: PhotoIcon, allowedRoles: ['admin', 'organizer'] },
+    { name: t('admin.nav.photos'), href: '/admin/photos', icon: CameraIcon, allowedRoles: ['admin', 'organizer'] },
     { name: locale === 'es' ? 'Páginas Legales' : 'Legal Pages', href: '/admin/legal-pages', icon: DocumentTextIcon, allowedRoles: ['admin'] },
     { name: 'FAQ', href: '/admin/faq', icon: QuestionMarkCircleIcon, allowedRoles: ['admin'] },
     { name: locale === 'es' ? 'Configuración' : 'Settings', href: '/admin/settings', icon: Cog6ToothIcon, allowedRoles: ['admin'] },