### What problem does this PR solve?
This PR introduces automatic table orientation detection and correction
within the PDF parser. This ensures that tables in PDFs are correctly
oriented before structure recognition, improving overall parsing
accuracy.
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
- [x] Documentation Update
### What problem does this PR solve?
The `ocr.res` file is already included in the model directory
`rag/res/deepdoc`, but it doesn't seem to be utilized here.
### Type of change
- [x] Documentation Update
### What problem does this PR solve?
Add Chinese explanation for deepdoc
### Type of change
- [ ] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [*] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):
