🔐 Secure API keys & Add Git LFS for large files

- Added Git LFS configuration for large datasets and models
- Secured API keys using environment variables and dart-define
- Updated .gitignore to work with Git LFS
- Added all ML models and datasets to LFS tracking
- Created secure build script and documentation
- Fixed CSV file tracking issues

Large files now tracked by Git LFS:
- All .csv files (datasets)
- All .pickle/.pkl files (models)
- All .keras/.h5 files (neural networks)
- All .tflite files (mobile models)

Major Overhaul

Major overhaul

Major overhaul

models added:

feat: Clean repository structure and implement bug fixes

🎯 Major Updates:
- Fixed MBTI sharing/screenshot functionality
- Fixed quick tests showing incorrect MBTI results
- Enhanced MBTI result content with comprehensive details
- Removed old platform files (iOS, macOS, Linux, Windows, web)
- Removed large ML model files to reduce repository size
- Added APK build exclusions

🐛 Bug Fixes:
- MBTI sharing now works with route-based detection
- Quick tests properly show their own results
- Fixed type conversion issues in MBTI results
- Enhanced screenshot content for MBTI results

🧹 Repository Cleanup:
- Removed unused platform directories
- Removed large model files (personality_model.h5, personality_model.tflite)
- Updated .gitignore for APK files
- Streamlined to Android-focused project

📱 Built Features:
- Android APK ready for distribution (excluded from repo due to size)
- All personality test functionality working correctly
- Enhanced MBTI result sharing with detailed content

machine learning algorithm changed.

✨ better animation & History! 🚀