Refactor systemctl services and categories due to alarm bugs

This commit restructures systemctl service definitions and category mappings.

Motivation: Alarm-related bugs revealed inconsistencies in service and role handling.

Preparation step: lays the groundwork for fixing the alarm issues by aligning categories, roles, and service templates.

roles/sys-ctl-hlth-msmtp/templates/sys-ctl-hlth-msmtp.service.j2

@@ -0,0 +1,7 @@
+[Unit]
+Description=Check msmtp liveliness
+OnFailure=sys-ctl-alm-telegram.{{ SOFTWARE_NAME }}@%n.service
+
+[Service]
+Type=oneshot
+ExecStart=/bin/bash {{ health_msmtp_folder }}sys-ctl-hlth-msmtp.sh

roles/sys-ctl-hlth-msmtp/templates/sys-ctl-hlth-msmtp.sh.j2

@@ -0,0 +1,4 @@
+#!/bin/bash
+echo "Subject: $HOST is alive
+
+Host $HOSTNAME reports at $(date): I'm alive." | msmtp -t {{ users.administrator.email }}