GalvinYang

# Description fix the system default model name length which cause user cannot save model which name has more than 40 chars as their system default model. Fixes # 4245...

system default model saved error in backend but show success in the webapp

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### Self Checks - [X] This is only for bug report, if you would like to ask a quesion, please head to [Discussions](https://github.com/langgenius/dify/discussions/categories/general). - [X] I have searched for existing...