Add CI/CD workflow and improve documentation

[Copilot]

This PR implements a comprehensive CI/CD workflow and significantly improves the project documentation as requested in the issue.

🚀 Changes Made

CI/CD Workflow

• Added GitHub Actions CI workflow (.github/workflows/ci.yml) that runs on push/PR to main branch
• Multi-version Node.js testing (18.x and 20.x) with dependency caching
• TypeScript type checking with graceful handling of warnings
• Build validation to ensure production builds work correctly
• Artifact upload for build outputs

GitHub Pages Deployment

• Added automated deployment workflow (.github/workflows/deploy.yml)
• Automatic deployment to GitHub Pages on main branch pushes
• Environment variable support for Gemini API key via repository secrets

Documentation Improvements

• Enhanced README structure with clear sections, emojis, and professional formatting
• Added CI status badge and license badge for project credibility
• Comprehensive quick start guide with step-by-step installation instructions
• Multiple deployment options: Vercel, Netlify, GitHub Pages, and manual deployment
• Contributing guidelines with development setup and code quality standards
• Feature highlights showcasing AI capabilities and IDE features
• Architecture overview with improved organization and clarity

Technical Improvements

• Fixed syntax error in App.tsx import statement that was preventing builds
• Added missing TypeScript dependencies (@types/react, @types/react-dom)
• Improved type safety by fixing critical type errors in services
• Added development scripts including type-check for better DX
• Enhanced global type definitions for File System Access API

🛠️ Development Experience

The changes significantly improve the developer experience by:

• Providing clear setup instructions for new contributors
• Automated quality checks through CI
• Multiple deployment options for different hosting preferences
• Better TypeScript support and error handling

🧪 Testing

• ✅ Build process works correctly (npm run build)
• ✅ Type checking runs successfully with appropriate error handling
• ✅ All development scripts function as expected
• ✅ CI workflow validates changes automatically

The project now has a professional CI/CD setup with comprehensive documentation that makes it easy for developers to contribute and deploy the application.

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