sessionOptions.token（仅限客户端）
🌐 sessionOptions.token (client only)
先前通过 session.onnewtoken 回调从服务器接收的不透明地址验证令牌。在重新连接时提供有效的令牌可以让客户端跳过服务器的地址验证，从而减少握手延迟。
🌐 An opaque address validation token previously received from the server
via the session.onnewtoken callback. Providing a valid token on
reconnection allows the client to skip the server's address validation,
reducing handshake latency.