Add image management functionality: introduce Image entity and related API endpoints, update database schema to support image storage, and enhance UI with a new gallery feature for image selection and upload. Update translations for gallery-related terms.

frontend/src/routes/admin.tsx

@@ -36,6 +36,13 @@ function AdminLayout() {
         >
           {t('admin.channels.title')}
         </Link>
+        <Link
+          to="/admin/gallery"
+          className={cn('pb-2 uppercase tracking-wide text-muted-foreground hover:text-foreground')}
+          activeProps={{ className: 'border-b-2 border-primary text-primary' }}
+        >
+          {t('admin.gallery.title')}
+        </Link>
         <Link
           to="/admin/roles"
           className={cn('pb-2 uppercase tracking-wide text-muted-foreground hover:text-foreground')}

frontend/src/routes/admin/gallery.tsx

@@ -0,0 +1,4 @@
+import { createFileRoute } from '@tanstack/react-router'
+import { GalleryPanel } from '@/features/admin/images/GalleryPanel'
+
+export const Route = createFileRoute('/admin/gallery')({ component: GalleryPanel })