chore: update .gitignore with comprehensive exclusions

[cj4c0b1]

This PR updates the .gitignore file with comprehensive exclusions for a Python project:

• Added virtual environment directories (.venv/, venv/, env/, ENV/)
• Added IDE-specific files (.idea/, .vscode/, vim swap files)
• Added environment variable files (.env, .env.local, etc.)
• Added log and database files (*.log, *.sql, *.sqlite)
• Added Jupyter Notebook checkpoints
• Added test coverage reports and cache directories
• Added local development settings
• Added macOS-specific files (.DS_Store, .AppleDouble, etc.)
• Cleaned up redundant entries and improved organization