How to handle niche case with multi-tenant

I am currently running better-auth at app.domain.com this is the place where my users can have their dashboard, and so I authenticate them (email/pass, google and github) and I use better-auth for that (so my BASE_URL of better auth is: app.domain.com).

Each user can create its own example.domain.com, at this site the I need to authenticate the visitors of my user's site, with only magic link, google and github.

So, I think, I cannot use better-auth for that, and TBH I have no idea on how to handle this situation, any ideas? Ik it's not completely related to better auth, but probably there's already something built-in to handle this situation that I cannot found.

Thank to y'all! ❤️ for the amazing package

P.S. I read all the doc of Admin and Organization, but I realized that it's not probably what I am looking for.
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