feat(db): add rent_payment_destinations column and multi-schema support

- Add migration 0020 for rent_payment_destinations jsonb column
- Add DB_SCHEMA env var support for multi-schema deployments
- Create custom migrate.ts script with proper search_path handling
- Update drizzle.config.ts and client.ts to use DB_SCHEMA
- Add db_schema variable to Terraform with dev=test/prod=public defaults
- Update CD workflow to set DB_SCHEMA based on branch

.github/workflows/cd.yml

@@ -100,6 +100,7 @@ jobs:
       - name: Run database migrations
         env:
           DATABASE_URL: ${{ secrets.DATABASE_URL }}
+          DB_SCHEMA: ${{ github.ref == 'refs/heads/main' && 'public' || 'test' }}
         run: bun run db:migrate
 
       - name: Setup gcloud