Release v1.0.0 - Initial Release

✨ Features:
- Base100 cast for storing decimals as integers (cents)
- HasBase100 trait for convenient bulk casting
- Configurable rounding modes (Half Up, Half Even, Half Down, Half Odd)
- Optional BCMath support for arbitrary precision
- Environment variable configuration
- Per-attribute rounding override

🧪 Quality:
- 22 tests, 59 assertions (all passing)
- PHPStan level 6 compliant
- Laravel Pint formatted
- GitHub Actions CI/CD

📦 Compatibility:
- PHP 8.3 and 8.4
- Laravel 11 and 12

📚 Documentation:
- Complete usage examples
- Rounding modes explanation
- Configuration guide
- Comparison with alternatives