Replace the llm dependencies with uv

[cgwer]

1 Description

• [x]This PR migrates the dependency management in the hugegraph-llm project from Poetry to uv. uv is a high-performance Python package manager written in Rust that provides 10-100x performance improvement over Poetry.

2 Key Changes

• Dependency Management: Removed [tool.poetry.dependencies] section and replaced it with the standard [project.dependencies] format
  Package Index Configuration: Added [tool.uv] section to configure PyPI sources, including multiple mirror repositories
  Removed Files: Deleted the poetry.lock lockfile & setup.py (not use, because of uv config)

Code of Conduct

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