Add uv support to README files

[BaqiF2]

Summary

Added uv installation and usage instructions to both README.md and README_zh.md files. Also added uv dependencies to pyproject.toml and uv.lock for better package management.

Changes

• Added 'With uv (recommended)' section to Quick Start in both README files
• Provided uv installation command: curl -LsSf https://astral.sh/uv/install.sh | sh
• Added uv add commands for dependency management
• Added uv run python commands for running examples
• Updated both English and Chinese versions
• Added required dependencies (anthropic, python-dotenv) to pyproject.toml
• Generated uv.lock for faster dependency resolution
• Maintains backward compatibility with pip

Why uv?

uv is a faster, more reliable alternative to pip for Python package management:

• Faster dependency resolution
• Better virtual environment management
• Improved performance for CI/CD