[Feature] Mark the source of the document after specific points in the response

[wyohello]

MaxKB Version

v2.0.1 (build at 2025-07-18T18:47, commit: 4cf2b74)

Please describe your needs or suggestions for improvements

It is hoped that citations to source documents can be marked at specific points in the responses. This will be useful when users need to further understand the document details or reference them in their own reports. Below is a sample illustration of the desired effect.

Please describe the solution you suggest

No response

Additional Information

No response

[wyohello]

If privacy and security are taken into consideration, this can be made an optional feature that users can choose to enable or disable.