export function parsePort(argv: string[] = process.argv.slice(2)): number {
	const idx = argv.indexOf("--port");
	const raw = idx !== -1 ? argv[idx + 1] : "19133";
	const port = parseInt(raw || "19133", 10);
	if (!Number.isFinite(port) || port < 1 || port > 65535) {
		throw new Error(`无效端口: ${raw}`);
	}
	return port;
}