feat: add default model support

[notdp]

After the appearance of gpt-3.5-turbo-1106, the price is lower, and the speed is much faster. At this time, it would be more appropriate to set a default model as gpt-3.5-turbo-1106, especially when sharing the agent site with friends.

So I tried to increase the environment variables of the default model, and I also noticed that there is a summarize model in the project, which has been configured together.

[notdp]

#444

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#444

[Niansuh]

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