Move systemd service file and OpenRC init script to files folder

files/ddns-service.service

@@ -0,0 +1,23 @@
+[Unit]
+Description=DDNS Service - Dynamic DNS Update Service
+After=network.target
+
+[Service]
+Type=simple
+User=ddns
+Group=ddns
+WorkingDirectory=/opt/ddns-service
+ExecStart=/usr/bin/ddns-service --daemon
+ExecReload=/bin/kill -HUP $MAINPID
+Restart=on-failure
+RestartSec=5
+
+# Security hardening
+NoNewPrivileges=yes
+ProtectSystem=strict
+ProtectHome=yes
+PrivateTmp=yes
+ReadWritePaths=/var/lib/ddns-service
+
+[Install]
+WantedBy=multi-user.target