revert: remove SUPABASE_PUBLIC_URL env var

The OAuth protected resource redirect feature doesn't require
SUPABASE_PUBLIC_URL. Edge Functions can handle URL resolution
themselves using custom env vars like PUBLIC_URL if needed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Rodriguespn

internal/functions/serve/serve.go

@@ -129,7 +129,6 @@ func ServeFunctions(ctx context.Context, envFilePath string, noVerifyJWT *bool,
 	jwks, _ := utils.Config.Auth.ResolveJWKS(ctx)
 	env = append(env,
 		fmt.Sprintf("SUPABASE_URL=http://%s:8000", utils.KongAliases[0]),
-		"SUPABASE_PUBLIC_URL="+utils.Config.Api.ExternalUrl,
 		"SUPABASE_ANON_KEY="+utils.Config.Auth.AnonKey.Value,
 		"SUPABASE_SERVICE_ROLE_KEY="+utils.Config.Auth.ServiceRoleKey.Value,
 		"SUPABASE_DB_URL="+dbUrl,