Add Docker Registry AIO with Nuxt Token Auth and admin UI.

Compose brings up registry:3 plus a Prisma/SQLite Nuxt app for docker login, ACL management, and image browsing with shadcn-vue.

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

app/server/api/health.get.ts

@@ -0,0 +1,3 @@
+export default defineEventHandler(() => {
+  return { ok: true, service: 'registry-aio' }
+})