### What problem does this PR solve?
Feat: Delete useless request hooks. #10427
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### 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)
### What problem does this PR solve?
Fix: Optimize code and fix ts type errors #9869
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
These changes are intended to implement the remaining functionalities of
the fullscreen widget.
The question arises: how to display document prieview of PDFs in this
floating widget?
- simply enlarge the widget window
- implement zoom in/out
- render outside the iframe?
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
