upgrade transformers to 5.1.0

[JaredforReal]

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[Copilot]

Pull request overview

This PR upgrades the HuggingFace Transformers library from version 4.30.0 to 5.1.0, which represents a major version upgrade. The change eliminates the previous requirement to install transformers from source, suggesting that the necessary features (particularly PPDocLayoutV3 support for layout detection) are now available in the stable 5.1.0 release.

Changes:

• Updated transformers dependency from >=4.30.0 to >=5.1.0 in main dependencies and layout extras
• Removed installation instructions for installing transformers from GitHub source in both English and Chinese READMEs

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Updated transformers version requirement in main dependencies (line 40) and layout optional dependencies (line 56)
README.md	Removed instructions to install transformers from source, simplifying installation steps
README_zh.md	Removed instructions to install transformers from source (Chinese version)

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