chore: optimize project metadata and documentation

[AIPMAndy]

Changes

This PR optimizes project metadata and documentation:

Added

• .gitignore for Python project
  • Standard Python patterns (__pycache__, *.pyc, .pytest_cache, etc.)
  • Virtual environments (.venv, venv/, etc.)
  • Build artifacts (dist/, build/, *.egg-info/)
  • IDE files (.vscode/, .idea/, .DS_Store)
  • Environment files (.env)

Updated

• README.md and README_EN.md
  • Highlighted CONTRIBUTING.md link in the Related docs section with bold formatting
  • Makes the contribution guide more discoverable for potential contributors

Rationale

• The .gitignore file prevents committing build artifacts, cache files, and IDE-specific files
• Highlighting CONTRIBUTING.md improves discoverability and encourages community contributions

Testing

• Verified .gitignore covers standard Python patterns
• Confirmed README formatting is correct