[Feature] Users can provide feedback after the conversation is completed

### MaxKB Version

2.2.1

### Please describe your needs or suggestions for improvements

用户可以在对话完成后提供反馈（对这条回答的建议），而不只是踩和赞，用户能够在回答的下方点击反馈，这样我们后台就能看到用户针对每个问题的意见了

<img width="1910" height="1035" alt="Image" src="https://github.com/user-attachments/assets/9e4f4db1-9618-4cec-9e72-003f4f501aea" />

### Please describe the solution you suggest

_No response_

### Additional Information

_No response_