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Add new configuration options for custom model directories and device modeselection. This allows users to specify the directory where models are stored
and choose between CPU and GPU modes for model inference. The configurations
are read from a JSON file and can be easily extended to support additional
options in the future.

Introduce a new feature that allows users to choose between a "lite" and a "full"
model mode for PDF document analysis. The "lite" mode uses a faster, less
accurate model, while the "full" mode employs a higher-precision model at the
cost of speed. This selection can be made through the CLI or API, providing
flexibility for different use cases.

update:Add md make mode config in do_parse.You can control whether the produced md is for NLP or MM by changing the value of f_make_md_mode

1.Disable scaling when loading large images.
2.Moving the logic for channel conversion in image processing.

fix: The presence of ".pdf" multiple times in the pdf_path results in model_path not matching the expected.