Set up Copilot agent environment

[njzjz]

Follow https://docs.github.com/en/copilot/how-tos/use-copilot-agents/coding-agent/customize-the-agent-environment to set up Coilpot agent environment.

1. Use uv to set up Python environments and install Python dependencies.
2. Use uvx to install pre-commit. Use pre-commit install --install-hooks.
3. Use uvx to install pyright.

Please also update Coilpot instructions to prefer using pre-commit directly over ruff and prettier.