v0.2.0

feat: Add lazy loading for translations and simplify README

## Added
- Lazy loading for translations with auto-detection
- Translation API endpoints (GET/POST /lingua/translations)
- Middleware parameters for explicit groups
- PageTranslationResolver for page-to-translation mapping
- TranslationCache with in-memory and persistent caching

## Changed
- README.md completely rewritten for simplicity (~630 → ~244 lines)
- Clear 5-step Quick Start guide
- Concise API reference and lazy loading documentation