created <parent>/sm-demo-app

Next steps, inside sm-demo-app:
  docker compose up -d --wait
  summer build
  summer migrate
  summer serve

Then, from another terminal:
  curl http://127.0.0.1:8080/

Admin, at http://127.0.0.1:8080/backend once a plugin registers an admin
controller (.env already holds SUMMER_ADMIN__JWT__SECRET):
  summer make:admin-controller golem15.<plugin> <Name>
  summer build
  summer migrate
  summer admin:create --email you@example.com --superuser