GitLab

- Combine __is_list_block() and __is_index_block() into a single function __is_list_or_index_block()
- Simplify block type determination logic
- Remove redundant code and improve readability
- Optimize block merging process

- Add detection for list and index blocks in OCR processing- Implement merging of list and index blocks across pages
- Update block types to include list and index categories
- Adjust text merging logic to handle new block types
- Modify layout drawing to distinguish list and index blocks

- Reintegrate para_split_v3 into the pdf_parse_union_core_v2 process
- Add support for specifying page range in doc_analyze_by_custom_model
- Implement garbage collection and memory cleaning after processing
- Refine image loading from PDF, including handling out-of-range pages