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/(public)/photos/page.tsx

@@ -0,0 +1,30 @@
+import type { Metadata } from 'next';
+import type { PhotoGallery } from '@/lib/api';
+import PhotosIndexClient from './PhotosIndexClient';
+
+// Server-side calls go straight to the photo-api service; the browser uses
+// the same-origin /api/photos path via the Next rewrite / nginx.
+const photoApiUrl = process.env.PHOTO_API_URL || 'http://localhost:3003';
+
+export const metadata: Metadata = {
+  title: 'Event Photo Galleries',
+  description: 'Photos from past Spanglish language exchange events in Asunción.',
+};
+
+async function getGalleries(): Promise<PhotoGallery[]> {
+  try {
+    const res = await fetch(`${photoApiUrl}/api/photos/public/galleries`, {
+      next: { revalidate: 300 },
+    });
+    if (!res.ok) return [];
+    const data = await res.json();
+    return data.galleries || [];
+  } catch {
+    return [];
+  }
+}
+
+export default async function PhotosPage() {
+  const galleries = await getGalleries();
+  return <PhotosIndexClient galleries={galleries} />;
+}