This commit significantly expands the domain models to fully represent the quiz structure and implements the complete mapping logic in `QuizMapper` to convert `QuizResponseDto` and its nested DTOs to their corresponding domain models.
Key changes:
- **Domain Layer (`domain` module):**
- Introduced a `QuizId` value class for type safety.
- Added comprehensive domain models for all aspects of a quiz, including:
- `Quiz`: Updated to include all fields from the DTO.
- `Question`, `Choice`, `Video`, `ImageMetadata`, `MediaItem`, `ChoiceRange`: For question details.
- `CoverMetadata`, `ExtractedColor`, `Crop`, `Point`: For cover image information.
- `ContentTags`: For curriculum and generated codes.
- `Metadata`, `Access`, `FeaturedListMembership`, `LastEdit`, `VersionMetadata`: For quiz metadata.
- `LanguageInfo`, `Channel`: Common reusable models.
- Organized domain models into separate files for better maintainability (e.g., `Question.kt`, `CoverMetadata.kt`).
- Added a placeholder `QuestionModels.kt` to indicate that models were moved.
- **Data Layer (`model:data` module):**
- Implemented a complete `toDomainModel()` extension function in `QuizMapper.kt` to map all fields from `QuizResponseDto` and its nested DTOs (like `CoverMetadataDto`, `QuestionDto`, etc.) to the new domain models.
- This includes mapping for lists and nullable fields.
- **App Module (`app` module):**
- Updated `MainActivity` to access `quizId.value` due to `QuizId` being a value class.
- **Network Layer (`core:network` module):**
- Changed `QuizResponseDto.uuid` to be non-nullable (`String`) as it's essential for mapping to `QuizId`.
- Removed `QuizResponse.kt` as DTOs were previously split into individual files.
