### What problem does this PR solve?

This pull request fixes the issue mentioned in
https://github.com/infiniflow/ragflow/issues/3263.

1. response should be parsed as dict, prevent the following code from
failing to take values:
ans = response["content"][0]["text"]
2. API Model ```claude-instant-1.2``` has retired (by
[model-deprecations](https://docs.anthropic.com/en/docs/resources/model-deprecations)),
it will trigger errors in the code, so I deleted it from the
conf/llm_factories.json file and updated the latest API Model
```claude-3-5-sonnet-20241022```



### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: chenhaodong <chenhaodong@ctrlvideo.com>
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>