chore(db): setup supabase client and env variables #3
Description
Configure the connection to the Supabase Database.
- Install @supabase/supabase-js.
- Create lib/supabaseClient.ts for the singleton instance.
- Add .env.local with NEXT_PUBLIC_SUPABASE_URL and NEXT_PUBLIC_SUPABASE_ANON_KEY.
- Crucial: Verify connection to the shared users table (Read-Only test).