frps dashboard 代理类型增加 xtcp

[wuai1024]

Describe the feature request

目前图标上显示了 xtcp 有3个代理，但是左侧看不到，没有 xtcp 的类型选择。

Describe alternatives you've considered

No response

Affected area

• [ ] Docs
• [ ] Installation
• [ ] Performance and Scalability
• [ ] Security
• [ ] User Experience
• [ ] Test and Release
• [ ] Developer Infrastructure
• [ ] Client Plugin
• [ ] Server Plugin
• [ ] Extensions
• [X] Others