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-cln-disc-space/README.md

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+# Cleanup Disc Space
+
+## Description
+
+This role frees disk space by executing a script that cleans up temporary files, clears package caches, and optionally cleans up backup directories and Docker resources when disk usage exceeds a specified threshold.
+
+## Overview
+
+Optimized for efficient storage management, this role:
+- Creates a directory for disk cleanup scripts.
+- Deploys a Bash script that frees disk space by cleaning up /tmp, Docker resources, and pacman cache.
+- Configures a systemd service to run the disk cleanup script.
+- Optionally integrates with backup cleanup if backup variables are defined.
+
+## Purpose
+
+The primary purpose of this role is to ensure that disk space remains within safe limits by automating cleanup tasks, thereby improving system performance and stability.
+
+## Features
+
+- **Automated Cleanup:** Executes a script to remove temporary files and clear caches.
+- **Threshold-Based Execution:** Triggers cleanup when disk usage exceeds a defined percentage.
+- **Systemd Integration:** Configures a systemd service to manage the disk cleanup process.
+- **Docker and Backup Integration:** Optionally cleans Docker resources and backups if configured.