Theme switch support (#3568)

Web: Fixed the download and preview file not authorized. (#3652)

Unified API response json schema (#3170)

fix: reference file with 'docx' type can not open #844 (#1635)

feat: change all file names to lowercase #1574 (#1575)

fix: display specific error message when previewing file error #868 (#869)

fix: remove Top K in retrieval testing #770 and if the document parsing fails, the error message returned by the backend is displayed (#782)

feat: delete the added model #503 and display an error message when the requested file fails to parse #684 (#708)

fix: fix uploaded file time error #680 (#690)

feat: support DeepSeek (#667)