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

group_vars/all/00_general.yml

@@ -65,9 +65,9 @@ DOCKER_RESTART_POLICY:                    "unless-stopped"
 DOCKER_VARS_FILE:                         "{{ playbook_dir }}/roles/docker-compose/vars/docker-compose.yml"
 
 # Asyn Confitguration
-ASYNC_ENABLED:  "{{ not MODE_DEBUG | bool}}"            # Activate async, deactivated for debugging
-ASYNC_TIME:     "{{ 300 if ASYNC_ENABLED else omit }}"  # Run for mnax 5min
-ASYNC_POLL:     "{{ 0 if ASYNC_ENABLED else 10 }}"      # Don't wait for task
+ASYNC_ENABLED:  "{{ not MODE_DEBUG | bool }}"                  # Activate async, deactivated for debugging
+ASYNC_TIME:     "{{ 300 if ASYNC_ENABLED | bool else omit }}"  # Run for mnax 5min
+ASYNC_POLL:     "{{ 0 if ASYNC_ENABLED | bool else 10 }}"      # Don't wait for task
 
 # default value if not set via CLI (-e) or in playbook vars
 allowed_applications: []