feat: introduce systemd config

roles/systemd/README.md

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+# Systemd Role
+
+Manages systemd-journald configuration for efficient log management and storage control.
+
+## Overview
+
+This role configures systemd's journal daemon (`systemd-journald`) to control log storage, retention, and rotation. It's designed to prevent excessive disk usage from system logs while maintaining sufficient logging for troubleshooting.
+
+## Hands-on commands
+
+```bash
+# Disk usage
+sudo journalctl --disk-usage
+
+# Current configuration
+systemctl show systemd-journald
+
+# Verify configuration
+sudo journalctl --verify
+
+# Manual cleanup by time
+sudo journalctl --vacuum-time=2weeks
+
+# Manual cleanup by size
+sudo journalctl --vacuum-size=500M
+
+# Manual cleanup by file count
+sudo journalctl --vacuum-files=10
+```
+
+## References
+
+- [journald.conf(5) man page](https://www.freedesktop.org/software/systemd/man/journald.conf.html)
+- [systemd-journald.service(8)](https://www.freedesktop.org/software/systemd/man/systemd-journald.service.html)
+- [journalctl(1) man page](https://www.freedesktop.org/software/systemd/man/journalctl.html)
+- [Arch Wiki: systemd/Journal](https://wiki.archlinux.org/title/Systemd/Journal)