This is actually a cool approach to doing things although I need you to clarify just a very simple thing for me

1. How did you go about your environment variable in vercel did you use FASTAPI_URL == port 8000?
   I just want to know how I can set my FASTAPI_URL even though i bought my own domain

├── frontend/ (Next.js)
│ ├── app/
│ │ ├── page.tsx
│ │ ├── auth/
│ │ │ └── page.tsx
│ │ ├── chat/
│ │ │ └── page.tsx
│ │ ├── api/
│ │ │ └── auth/
│ │ │ └── [...nextauth]/
│ │ │ └── route.ts
│ │ └── components/
│ │ └── auth/
│ │ ├── auth-heading.tsx
│ │ └── close-button.tsx
│ ├── next.config.js
│ └── package.json
├── backend/ (FastAPI)
│ ├── main.py
│ ├── api/
│ │ └── routes/
│ │ └── auth.py
│ ├── schemas/
│ │ └── auth.py
│ ├── services/
│ │ ├── auth.py
│ │ └── supabase.py
│ └── config/
│ └── settings.py