## 1. Add relay_domain variable

- [x] 1.1 Add `relay_domain` to `group_vars/relay.yml`
- [x] 1.2 Add `relay_domain` placeholder to `group_vars/relay.yml.example`

## 2. Update Surge template

- [x] 2.1 Replace `hostvars[groups['relay'][0]]['ansible_host']` with `hostvars[groups['relay'][0]]['relay_domain']` in `templates/surge-client.conf.j2`

## 3. Verify

- [x] 3.1 Run `ansible-playbook site.yml --syntax-check` to confirm playbook parses