Layer-Based Clean Architecture

Priority: P0 (CRITICAL)

Workflow: Add New Feature Across Layers

1. Define domain entity with @freezed in lib/domain/entities/
2. Define repository interface in lib/domain/repositories/
3. Create DTO in lib/infrastructure/dtos/ with fromJson/toEntity mapper
4. Implement repository in lib/infrastructure/repositories/
5. Wire BLoC/Cubit in lib/application/ consuming repository interface
6. Register bindings in get_it injection container
7. Build screen in lib/presentation/ using BlocBuilder

Structure