Refactor async task handling

- Standardize async/poll usage with 'ASYNC_ENABLED | bool'
- Add async/poll parameters to Cloudflare, Nginx, Mailu, MIG, Nextcloud, and OpenLDAP tasks
- Update async configuration in 'group_vars/all/00_general.yml' to ensure boolean evaluation
- Allow CAA, cache, and DNS tasks to run asynchronously when enabled

https://chatgpt.com/share/689cd8cc-7fbc-800f-bd06-a667561573bf

roles/svc-db-openldap/tasks/03_users.yml

@@ -18,8 +18,8 @@
       uidNumber:     "{{ item.value.uid | int }}"
       gidNumber:     "{{ item.value.gid | int }}"
     state: present            # ↳ creates but never updates
-  async: "{{ ASYNC_TIME if ASYNC_ENABLED else omit }}"
-  poll:  "{{ ASYNC_POLL if ASYNC_ENABLED else omit }}"
+  async: "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"
+  poll:  "{{ ASYNC_POLL if ASYNC_ENABLED | bool else omit }}"
   loop: "{{ users | dict2items }}"
   loop_control:
     label: "{{ item.key }}"
@@ -37,8 +37,8 @@
       objectClass: "{{ ldap.user.objects.structural }}"
       mail:        "{{ item.value.email }}"
     state: exact
-  async: "{{ ASYNC_TIME if ASYNC_ENABLED else omit }}"
-  poll:  "{{ ASYNC_POLL if ASYNC_ENABLED else omit }}"
+  async: "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"
+  poll:  "{{ ASYNC_POLL if ASYNC_ENABLED | bool else omit }}"
   loop: "{{ users | dict2items }}"
   loop_control:
     label: "{{ item.key }}"

roles/svc-db-openldap/tasks/04_update.yml

@@ -21,8 +21,8 @@
     attributes:
       objectClass: "{{ missing_auxiliary }}"
     state: present
-  async: "{{ ASYNC_TIME if ASYNC_ENABLED else omit }}"
-  poll:  "{{ ASYNC_POLL if ASYNC_ENABLED else omit }}"
+  async: "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"
+  poll:  "{{ ASYNC_POLL if ASYNC_ENABLED | bool else omit }}"
   loop: "{{ ldap_users_with_classes.results }}"
   loop_control:
     label: "{{ item.dn }}"