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

roles/sys-ctl-alm-compose/templates/script.sh.j2

@@ -0,0 +1,11 @@
+#!/bin/bash
+err=0
+set -u
+{% for alarm_service in SYSTEMCTL_ALARM_COMPOSER_SUBSERVICES %}
+{% set alarm_service_full_name = alarm_service | get_service_name(SOFTWARE_NAME, '"$1".service') %}
+if ! /usr/bin/systemctl start {{ alarm_service_full_name }}; then
+  echo "ERROR: Failed to start {{ alarm_service_full_name }}" >&2
+  err=1
+fi
+{% endfor %}
+exit $err

roles/sys-ctl-alm-compose/templates/systemctl@.service.j2

@@ -1,10 +0,0 @@
-[Unit]
-Description={{ SOFTWARE_NAME }} - Alarm Notifier for %i
-
-[Service]
-Type=oneshot
-{% for alarm_service in [ SYS_SERVICE_ON_FAILURE_EMAIL, SYS_SERVICE_ON_FAILURE_TELEGRAM ] %}
-ExecStart=/usr/bin/systemctl start {{ alarm_service }}
-{% endfor %}
-User=root
-Group=systemd-journal