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[myhloli]

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Motivation

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Modification

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Checklist

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[Copilot]

Pull request overview

This PR refactors the PDF rendering timeout mechanism by replacing per-task timeout with a global timeout and adds configurable process count control for PDF rendering operations.

Changes:

• Refactored timeout handling in load_images_from_pdf() to use wait() with a single global timeout instead of individual future timeouts
• Added MINERU_PDF_RENDER_THREADS environment variable to control the number of processes used for PDF rendering
• Implemented explicit process termination logic using signals for better cleanup on timeout or errors

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 14 comments.

File	Description
mineru/utils/pdf_image_tools.py	Refactored timeout handling to use global timeout with wait(), added configurable threads parameter with environment variable support, and implemented explicit process termination using signals
mineru/utils/os_env_config.py	Added get_load_images_threads() function to read the MINERU_PDF_RENDER_THREADS environment variable
docs/zh/usage/cli_tools.md	Added documentation for the new MINERU_PDF_RENDER_THREADS environment variable and clarified platform support
docs/en/usage/cli_tools.md	Added documentation for the new MINERU_PDF_RENDER_THREADS environment variable and improved wording for existing entries

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