Refactor systemctl services and timers

- Unified service templates into generic systemctl templates
- Introduced reusable filter plugins for script path handling
- Updated path variables and service/timer definitions
- Migrated roles (backup, cleanup, repair, etc.) to use systemctl role
- Added sys-daemon role for core systemd cleanup
- Simplified timer handling via sys-timer role

Note: This is a large refactor and some errors may still exist. Further testing and adjustments will be needed.

roles/sys-ctl-rpr-btrfs-balancer/templates/systemctl.service.j2

@@ -0,0 +1,7 @@
+[Unit]
+Description=auto balance btrfs
+OnFailure={{ SYS_SERVICE_ON_FAILURE_COMPOSE }}
+
+[Service]
+Type=oneshot
+ExecStart=/bin/sh -c 'btrfs-auto-balancer 90 10'