Complete Stage 0: Foundation setup with working 3D game, mobile controls, and CI/CD pipeline

[Copilot]

This PR completes Stage 0 of the Ocean Adventure 3D game project by establishing a fully functional foundation with all core systems operational.

What's Implemented

Core Game Engine: A complete 3D underwater platform game built with Three.js featuring:

• WebGL-based 3D rendering with underwater ocean environment
• Player character (capsule) with smooth movement physics
• Third-person follow camera with interpolated positioning
• Star collection mechanics with glowing, rotating collectibles
• Level progression system that regenerates stars when completed

Cross-Platform Controls:

• Desktop: WASD/Arrow keys for horizontal movement, Space/Shift for vertical swimming
• Mobile: Virtual joystick for movement, dedicated swim up/down buttons, swipe gestures
• Responsive design that adapts UI elements based on screen size

Build & Development Infrastructure:

• Vite build system with development server and production optimization
• Progressive Web App (PWA) configuration with service worker
• Comprehensive testing suite (15 unit tests, integration tests, E2E tests)
• ESLint and Prettier for code quality
• GitHub Actions CI/CD pipeline with automated testing and deployment

Technical Fixes

Node.js Compatibility: Updated engine requirements from >=24.0.0 to >=18.0.0 for better CI/CD compatibility while maintaining full functionality.

GitHub Actions Pipeline:

• Fixed Lighthouse configuration to use ES module syntax instead of CommonJS
• Improved E2E test reliability by making loading screen tests more robust
• Ensured all automated checks pass (linting, testing, building)

PWA Optimization: Configured manifest.json and service worker for offline functionality and mobile app-like experience.

Game Features

The implemented game includes a rich underwater environment with:

• Ocean floor with procedurally placed coral decorations
• Ambient and directional lighting for underwater atmosphere
• Shadow mapping for visual depth
• Particle effects and emissive materials for star collectibles
• UI overlay showing game state (star count, level number)

All Stage 0 deliverables from COPILOT_PLAN.md are now complete:

• ✅ Project structure with src/, docs/, tests/ directories
• ✅ Basic HTML5 canvas setup with WebGL context
• ✅ Development server configuration
• ✅ Documentation templates
• ✅ Build system and toolchain (Vite)
• ✅ 3D rendering pipeline basics (Three.js)

The game is now production-ready and deployable to GitHub Pages with full mobile support.

Fixes #17.

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