Admin: recompensas de reclutamiento (recruit-a-friend)

- lib/admin-recruit.ts: list/create/delete sobre home_recruitreward
  (required_friends, reward_name, item_id, item_quantity, item_link, icon_class).
- API: POST /api/admin/recruit, DELETE /api/admin/recruit/[id] (403 sin admin).
- UI: /admin/recruit con AdminRecruitManager (alta ordenada por amigos requeridos),
  enlace desde el índice del admin.
- i18n es/en (Admin): 10 claves nuevas.

Verificado: build OK, /admin/recruit 307→login, APIs 403 sin admin,
columnas confirmadas en la migración 0001_initial.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web-next/app/[locale]/admin/page.tsx

@@ -42,6 +42,11 @@ export default async function AdminPage({ params }: { params: Promise<{ locale:
             {t('manageUsers')}
           </Link>
         </li>
+        <li>
+          <Link href="/admin/recruit" className="text-sky-400 hover:underline">
+            {t('manageRecruit')}
+          </Link>
+        </li>
       </ul>
     </main>
   )