DoH Worker
- Wire-format: GET/POST /dns-query (RFC8484)
- JSON: GET /dns-json or /resolve ?name=mail.cloudzy.com&type=A (e.g., https://dns.cloudzy.com/resolve?name=mail.cloudzy.com&type=A)
- PTR (reverse) example: resolve mail.cloudzy.com then query PTR for its IP (see README)
- Health: GET /health