Feat: Delete useless knowledge base, chat, and search files. #10427 (#11568)

### What problem does this PR solve?

Feat: Delete useless knowledge base, chat, and search files.  #10427
### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/components/next-markdown-content/index.tsx

@@ -19,13 +19,14 @@ import { useTranslation } from 'react-i18next';
 import 'katex/dist/katex.min.css'; // `rehype-katex` does not import the CSS for you
 
 import {
+  currentReg,
   preprocessLaTeX,
+  replaceTextByOldReg,
   replaceThinkToSection,
   showImage,
 } from '@/utils/chat';
 
 import { cn } from '@/lib/utils';
-import { currentReg, replaceTextByOldReg } from '@/pages/chat/utils';
 import classNames from 'classnames';
 import { omit } from 'lodash';
 import { pipe } from 'lodash/fp';