Refactor alarm composer and sys-service handling:

- Introduce dynamic SYSTEMCTL_ALARM_COMPOSER_SUBSERVICES based on Mailu token and MODE_RESET
- Prevent inclusion of sys-ctl-alm-email when disabled
- Add system_service_is_template flag to avoid state-setting on template services
- Update notifications to reload daemon for @ template units
- Align msmtp execution conditions

See: https://chatgpt.com/share/692c7a71-afcc-800f-8aba-6800a042ce3b

roles/sys-ctl-alm-compose/tasks/01_core.yml

@@ -1,9 +1,7 @@
 - name: "Include dependent services for '{{ system_service_id  }}'"
   include_role:
     name: '{{ item }}'
-  loop:
-    - sys-ctl-alm-telegram
-    - sys-ctl-alm-email
+  loop:   '{{ SYSTEMCTL_ALARM_COMPOSER_SUBSERVICES }}'
   vars:
     flush_handlers:                   true
     system_service_timer_enabled:     false