research if we could migrate the API (next/node/cloudflare) to supabase functions

[4www]

Related but separate to radio4000/supabase#41, it could be nice to migrate our API code, so it runs inside supabase (instead of next/node/external-hosting).

• https://supabase.com/docs/guides/functions
• https://dev.to/buildandcodewithraman/deploying-your-website-with-supabase-hosting-a-step-by-step-guide-14ho

If we do all this, then deploying a new radio4000 instance, would "only" be deploying a new supabase + frontend (inside supabase)?