• Add iterator-based page loading in PageLoader and use it in the async pipeline data-loading thread
• Introduce pdf_to_images_pil_iter and make PDF rendering more robust with proper resource cleanup in image_utils On branch feature/pdf
  Changes to be committed:
  modified: glmocr/dataloader/page_loader.py
  modified: glmocr/pipeline/pipeline.py
  modified: glmocr/utils/image_utils.py

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• This PR fixes a typo or improves the documentation (if this is the case, you may skip the other checks).
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