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-svc-dns/tasks/01_core.yml

@@ -0,0 +1,32 @@
+---
+- name: "Validate CLOUDFLARE_API_TOKEN"
+  fail:
+    msg: >
+      The variable "CLOUDFLARE_API_TOKEN" must be defined and cannot be empty!
+  when: (CLOUDFLARE_API_TOKEN | default('') | trim) == ''
+
+- name: "Ensure all CAA records are present"
+  community.general.cloudflare_dns:
+    api_token: "{{ CLOUDFLARE_API_TOKEN }}"
+    zone:     "{{ item.0 }}"
+    record:   "@"
+    type:     CAA
+    flag:     0
+    tag:      "{{ item.1.tag }}"
+    value:    "{{ item.1.value }}"
+    ttl:      1
+    state:    present
+  loop: "{{ base_sld_domains | product(caa_entries) | list }}"
+  loop_control:
+    label: "{{ item.0 }} → {{ item.1.tag }}"
+  async: "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"
+  poll:  "{{ ASYNC_POLL if ASYNC_ENABLED | bool else omit }}"
+
+- name: "Ensure parent DNS (apex + parent FQDNs) exists"
+  include_role:
+    name: sys-dns-parent-hosts
+  vars:
+    parent_dns_proxied: false
+  when: run_once_sys_dns_parent_hosts is not defined
+
+- include_tasks: utils/run_once.yml