GitLab

Signed-off-by: zhanluxianshen <zhanluxianshen@163.com>

feat: update parse_doc function to support backend options and add environment variable instructions

- Remove unnecessary imports and code in batch_demo.py
- Update demo.py to use relative paths and improve code structure
- Adjust output directory structure in both scripts
- Remove redundant code and simplify functions

- Remove DropMode and MakeMode imports from user code
- Set default drop_mode to DropMode.NONE in get_markdown and get_content_list methods
- Remove md_make_mode parameter from get_content_list method
- Add dump_middle_json method to PipeResult
- Update examples in API documentation and demo script

- Create demo.py script for PDF file processing
- Implement PDF reading, classification, and inference usingOpendatalab's magic_pdf library- Add pipelines for OCR and text modes
- Include result visualization and markdown export

- Update model download instructions for versions 0.9.x and later
- Simplify demo scripts by removing unnecessary model configuration
- Add visualization function to draw bounding boxes
- Update CLI help message with new URL

fix(demo): add fallback to internal model when external model data is missingIf no valid model data is provided, the system now checks if an internal model
should be used. This enhances the robustness of the demo pipeline by providing
a default behavior when essential data is not available.