sys-svc-dns: add apex A/AAAA records for SYS_SVC_DNS_BASE_DOMAINS via task_include

This update introduces apex (@) A and optional AAAA records for all base SLD domains.
The tasks were moved into a new 02_apex.yml file and are looped using
SYS_SVC_DNS_BASE_DOMAINS. CAA record loops were updated accordingly.
See details: https://chatgpt.com/share/68c385c3-1804-800f-8c78-8614bc853f77

roles/sys-svc-dns/README.md

@@ -3,7 +3,8 @@
 Bootstrap and maintain **DNS prerequisites** for your web stack on Cloudflare.
 
 This role validates credentials and (by default) ensures:
-- **Wildcard A/AAAA records** (`*.parent`) for parent hosts via `sys-dns-wildcards` (no base/apex records)
+- **A (and optional AAAA) records** on the **apex** (`@`) for all **base SLD domains**
+- **Wildcard A/AAAA records** (`*.parent`) for parent hosts via `sys-dns-wildcards`
 - *(Optional)* **CAA** records for Let’s Encrypt (kept as a commented block you can re-enable)
 
 Runs **once per play** and is safe to include in stacks that roll out many domains.
@@ -13,10 +14,13 @@ Runs **once per play** and is safe to include in stacks that roll out many domai
 ## What it does
 
 1. **Validate `CLOUDFLARE_API_TOKEN`** is present (early fail if missing).
-2. **Ensure wildcard parent DNS exists** (`*.parent` derived from children):
+2. **Ensure apex A/AAAA exist** for every **base SLD** in `SYS_SVC_DNS_BASE_DOMAINS`:
+   - Writes `@  A` → `networks.internet.ip4`
+   - Writes `@ AAAA` → `networks.internet.ip6` (only if global and present)
+3. *(Optional)* **CAA records** for all base SLDs (commented in the tasks; enable if you want CAA managed here).
+4. **Ensure wildcard parent DNS exists** (`*.parent` derived from children):
    - Delegates to [`sys-dns-wildcards`](../sys-dns-wildcards/README.md)
    - Creates `A` (and `AAAA` if enabled) wildcard records on the Cloudflare zone, optionally proxied. 
-3. *(Optional)* **CAA records** for all base SLDs (commented in the tasks; enable if you want CAA managed here).
 
 > Parent hosts example:  
 > `c.wiki.example.com` → **parent** `wiki.example.com` (plus `example.com` apex)

roles/sys-svc-dns/tasks/01_core.yml

@@ -5,6 +5,13 @@
       The variable "CLOUDFLARE_API_TOKEN" must be defined and cannot be empty!
   when: (CLOUDFLARE_API_TOKEN | default('') | trim) == ''
 
+- name: "Apply apex A/AAAA for base domains"
+  include_tasks: 02_apex.yml
+  loop: "{{ SYS_SVC_DNS_BASE_DOMAINS | list }}"
+  loop_control:
+    loop_var: base_domain
+    label: "{{ base_domain }}"
+
 - name: "Ensure all CAA records are present"
   community.general.cloudflare_dns:
     api_token: "{{ CLOUDFLARE_API_TOKEN }}"
@@ -16,7 +23,7 @@
     value:    "{{ item.1.value }}"
     ttl:      1
     state:    present
-  loop: "{{ base_sld_domains | product(caa_entries) | list }}"
+  loop: "{{ SYS_SVC_DNS_BASE_DOMAINS | product(caa_entries) | list }}"
   loop_control:
     label: "{{ item.0 }} → {{ item.1.tag }}"
   async: "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"

roles/sys-svc-dns/tasks/02_apex.yml

@@ -0,0 +1,28 @@
+---
+- name: "Ensure A @ for {{ base_domain }}"
+  community.general.cloudflare_dns:
+    api_token:  "{{ CLOUDFLARE_API_TOKEN }}"
+    zone:       "{{ base_domain }}"
+    type:       A
+    name:       "@"
+    content:    "{{ networks.internet.ip4 }}"
+    proxied:    false
+    ttl:        1
+    state:      present
+  async: "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"
+  poll:  "{{ ASYNC_POLL if ASYNC_ENABLED | bool else omit }}"
+
+- name: "Ensure AAAA @ for {{ base_domain }} (if IPv6 is global)"
+  community.general.cloudflare_dns:
+    api_token:  "{{ CLOUDFLARE_API_TOKEN }}"
+    zone:       "{{ base_domain }}"
+    type:       AAAA
+    name:       "@"
+    content:    "{{ networks.internet.ip6 }}"
+    proxied:    false
+    ttl:        1
+    state:      present
+  when:
+    - (networks.internet.ip6 | default('') | trim) != ''
+  async: "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"
+  poll:  "{{ ASYNC_POLL if ASYNC_ENABLED | bool else omit }}"

roles/sys-svc-dns/vars/main.yml

@@ -1,4 +1,4 @@
 caa_entries:
 - tag: issue
   value: letsencrypt.org
-base_sld_domains: '{{ CURRENT_PLAY_DOMAINS_ALL | generate_base_sld_domains }}'
+SYS_SVC_DNS_BASE_DOMAINS: '{{ CURRENT_PLAY_DOMAINS_ALL | generate_base_sld_domains }}'