solidus

Hi guys, i’m facing a strange behaviour with a sample rails 6.1 app and solidus 3. I had initially installed only `solidus_core` gem and declare the mount in the `routes.rb` file but, when i add the `solidus_backend` gem, without mounting it, it declares all the `/admin` routes. It is a desidered behaviour? I’m searching the codebase of solidus to find the automount of the backend engine but i cannot find it. Any advice will be appreciated :pray:

To be more specific i had only mount the core engine as docs:
```mount Spree::Core::Engine, at: '/'```

Yeah, that's how it works. If I remember correctly, the other parts of Solidus (and many extensions) just draw their routes into Solidus's routes.

It makes a bunch of stuff a lot simpler, so I'm not sure there's a reasonable way to avoid that.

Founded: <https://github.com/solidusio/solidus/blob/master/backend/config/routes.rb#L3>

I think this is a wrong behaviour because i want to chose if i want mount the api engine or the backend engine. With this solidus gem is *too much magical* to be out of control easely

If you don't want backend, then don't require it. I don't see the issue.