Refactor alarm compose service and systemctl templates

- Fixed bug where not both alarm services (email + telegram) were triggered.
- Removed direct OnFailure references for email and telegram,
  now handled by unified compose service.
- Introduced 01_core.yml in sys-ctl-alm-compose to structure
  role execution (subservices → core service → test run).
- Added configurable variables SYSTEMCTL_ALARM_COMPOSER_SUBSERVICES
  and SYSTEMCTL_ALARM_COMPOSER_DUMMY_MESSAGE.
- Replaced dedicated @.service template with generic systemctl template
  using systemctl_tpl_* variables for flexibility.
- Updated script.sh.j2 to collect exit codes and print clear errors.
- Fixed typos and streamlined vars in sys-systemctl.

See conversation: https://chatgpt.com/share/68a46172-7c3c-800f-a69c-0cb9edd6839f

group_vars/all/07_services.yml

@@ -17,8 +17,6 @@ SYS_SERVICE_UPDATE_DOCKER:            "{{ 'update-docker'           | get_servic
 
 ## On Failure
 SYS_SERVICE_ON_FAILURE_COMPOSE:       "{{ 'sys-ctl-alm-compose'   | get_service_name(SOFTWARE_NAME,'%i.service') }}"
-SYS_SERVICE_ON_FAILURE_EMAIL:         "{{ 'sys-ctl-alm-email'     | get_service_name(SOFTWARE_NAME,'%i.service') }}"
-SYS_SERVICE_ON_FAILURE_TELEGRAM:      "{{ 'sys-ctl-alm-telegram'  | get_service_name(SOFTWARE_NAME,'%i.service') }}"
 
 ## Groups
 SYS_SERVICE_GROUP_BACKUPS: >