[MRG] finish some tasks in README and improve requirement

[HuaizhengZhang]

User description

RT

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PR Type

enhancement, documentation

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Description

• Updated the README to mark "Local RAG support" and "Anthropic Claude 3.5 Sonnet" tasks as completed.
• Removed the version constraint for the onnxruntime dependency in requirements.txt.

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Changes walkthrough 📝

	Relevant files
Documentation	README.md Update task completion status in README                                    README.md Marked "Local RAG support" task as completed. Marked "Anthropic Claude 3.5 Sonnet" task as completed. +2/-2
Enhancement	requirements.txt Modify `onnxruntime` dependency version constraint              requirements.txt Removed version constraint for onnxruntime. +1/-1

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