fix(alpine): restart_xray uses rc-service; OpenRC reload reads pidfile contents
`14. Restart Xray` failed on Alpine with `systemctl: command not found` — restart_xray was the only service action missing an Alpine branch. While fixing it, the OpenRC reload action was passing the pidfile path to `kill` instead of the PID inside it, so `rc-service x-ui reload` would have failed too.
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