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-journalctl/README.md

@@ -0,0 +1,13 @@
+# sys-ctl-hlth-journalctl
+
+## Description
+Scans `journalctl` over the last day for “error” entries and alerts if any are found.
+
+## Features
+- Runs `journalctl --since '1 day ago' | grep -i error`.
+- Exits non-zero on matches.
+- Scheduled via systemd timer.
+- Alerts via `sys-ctl-alm-compose` on detection.
+
+## Usage
+Include the role; set `on_calendar_health_journalctl` for your preferred schedule.