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/meta/main.yml

@@ -0,0 +1,21 @@
+galaxy_info:
+  author: "Kevin Veen-Birkenbach"
+  description: "Periodic MTA health-check: sends test mail via msmtp and alerts on failure."
+  company: |
+    Kevin Veen-Birkenbach  
+    Consulting & Coaching Solutions  
+    https://www.veen.world
+  license: "Infinito.Nexus NonCommercial License"
+  license_url: "https://s.infinito.nexus/license"
+  min_ansible_version: "2.9"
+  platforms:
+  - name: Archlinux
+    versions: ["rolling"]
+  galaxy_tags:
+  - monitor
+  - msmtp
+  - email
+  - health
+  - systemd
+  repository: "https://s.infinito.nexus/code"
+  documentation: "https://docs.infinito.nexus"