Remove sensitive environment files from repository tracking and add comprehensive Python ignore patterns including virtual environments, cache files, and environment variables. Also clean up staged __pycache__ binary files.
Add initial project structure including:
- .gitignore and VSCode settings
- Vite configuration and package.json with Vue 3 dependencies
- Basic HTML entry point and README update
- Core source files: App.vue, main.js, style.css
- Markdown editor component with plugin system and related types
- Sample HelloWorld component, router, and Pinia store
- Assets and SVG icons
This commit establishes the foundation for the Vue 3 application.
