[FEAT] add select method for choose Claude2 or Claude2.1

### Is your feature request related to a problem? / 你想要的功能和什么问题相关？

I know I can change code for change v2 to v2.1 and build source code, but is possible in main branch put an option for select one of those models?

### Describe the solution you'd like. / 你想要的解决方案是什么？

Form for choose or select one of 2 models

### Describe alternatives you've considered. / 你考虑过的其他方案是什么？

_No response_

### Additional context / 其他信息

_No response_