Fix model_task pydantic warning and skip flashinfer on non-linux

[xthomaswang]

Summary

• avoid the Pydantic protected namespace warning for model_task in MLCChatConfig
• skip flashinfer-python for non-Linux editable installs (tested in macos)

Details

• rename the internal Pydantic field to field_model_task and keep alias="model_task" so the serialized config format stays unchanged
• add a platform marker to python/requirements.txt so editable installs on macOS do not try to resolve flashinfer-python

[gemini-code-assist]

Summary of Changes

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This pull request enhances the project's stability and cross-platform compatibility by addressing a Pydantic warning in the MLCChatConfig to ensure robust configuration handling, and by refining the dependency management to prevent installation failures of flashinfer-python on non-Linux environments.

Highlights

• Pydantic Warning Fix: Resolved a Pydantic protected namespace warning by renaming the model_task field to field_model_task within MLCChatConfig and using an alias to maintain external API compatibility.
• Platform-Specific Dependency: Modified requirements.txt to conditionally install flashinfer-python only on Linux systems, preventing installation issues on other platforms like macOS.

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[gemini-code-assist]

Code Review

This pull request effectively addresses two distinct issues: a Pydantic protected namespace warning and cross-platform compatibility for a dependency. The change in mlc_chat_config.py correctly renames the internal field model_task to field_model_task and uses alias="model_task" to resolve the Pydantic warning while maintaining the external API, aligning with existing patterns in the class. The modification in requirements.txt to add sys_platform == "linux" for flashinfer-python is a pragmatic solution to prevent installation issues on non-Linux systems, as described in the PR details. Both changes are well-implemented and contribute positively to the codebase's robustness and maintainability.