feat(dns): add sys-svc-dns role and extend parent DNS handling

Introduce sys-svc-dns to bootstrap Cloudflare DNS prerequisites. Validates CLOUDFLARE_API_TOKEN, (optionally) manages CAA for base SLDs, and delegates parent record creation to sys-dns-parent-hosts. Wired into sys-stk-front-pure.

sys-dns-parent-hosts: new parent_dns filter builds A/AAAA for each parent host and wildcard children (*.parent). Supports dict/list inputs for CURRENT_PLAY_DOMAINS, optional IPv6, proxied flag, and optional *.apex. Exposes a single parent_build_records entry point.

Let’s Encrypt role cleanup: remove DNS/C AA management from sys-svc-letsencrypt; it now focuses on webroot challenge config and renew timer. Fixed path joins and run_once guards.

Tests: update unit tests to allow wildcard outputs and dict-based CURRENT_PLAY_DOMAINS. Add generate_base_sld_domains filter. Documentation updates for both roles.

Conversation: https://chatgpt.com/share/68c342f7-d20c-800f-b61f-cefeebcf1cd8

roles/sys-dns-parent-hosts/vars/main.yml

@@ -0,0 +1,12 @@
+SYN_DNS_PARENT_HOSTS_RECORDS: >-
+  {{ CURRENT_PLAY_DOMAINS
+      | parent_build_records(
+          PRIMARY_DOMAIN,
+          defaults_networks.internet.ip4,
+          (defaults_networks.internet.ip6 | default('')),
+          parent_dns_proxied,
+          (parent_dns_domains | default([])),
+          True,
+          2
+        )
+  }}