优化connect相关指令与输出

输入需要加/connect 202.189.12.139:31112，建议改成connect 202.189.12.139:31112
输出是connect: 202.189.12.139:31112，建议改成connect 202.189.12.139:31112

<img width="866" height="496" alt="Image" src="https://github.com/user-attachments/assets/d277b5b1-029d-48c8-bf54-a0f56dd9d06f" />