v1.2.0

(MINOR) feat: add color scheme configuration and tests

- Added `colorScheme` prop to control the color mode in `LuminixCms`.
- Introduced `darkTheme` prop for providing a distinct dark theme when `colorScheme="auto"`.
- Updated documentation (`CLAUDE.md` and `docs/configuracao.md`) with new props and usage instructions.
- Added tests (`src/__tests__/components/LuminixCms.test.tsx`) to cover the new color scheme functionality.