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-docker-container/README.md

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+# Docker Container Health Check
+
+## Description
+
+This role monitors the health status of Docker containers on the system. It detects containers that are either **unhealthy** or have **exited with a non-zero code**, and triggers alerts if issues are found.
+
+## Overview
+
+The role installs a health check script along with a `systemd` service and timer to run these checks at scheduled intervals.  
+If unhealthy or failed containers are detected, the configured failure notifier (via `sys-ctl-alm-compose`) is triggered.
+
+## Purpose
+
+The primary purpose of this role is to ensure that Docker-based services remain operational. By automatically monitoring container health, it enables administrators to react quickly to failures, reducing downtime and preventing unnoticed service degradation.
+
+## Features
+
+- **Automated Health Checks:** Detects containers in `unhealthy` state or exited with non-zero exit codes.
+- **Systemd Integration:** Installs a one-shot service and timer to run health checks on a schedule.
+- **Alerting Support:** Works with the [`sys-ctl-alm-compose`](../sys-ctl-alm-compose/README.md) role for failure notifications.
+- **Configurable Script Location:** Controlled via the `PATH_ADMINISTRATOR_SCRIPTS` variable.
+
+## Further Resources
+
+- [Docker Health Checks Documentation](https://docs.docker.com/engine/reference/run/#healthcheck)
+- [Systemd Timers Documentation](https://www.freedesktop.org/software/systemd/man/systemd.timer.html)