Refactored DTO classes by removing unnecessary using statements and internal wrappers, making them public, and adding explicit properties with default values. Clarified namespaces and improved accessibility for use in API contracts or service layers. Added CatalogUpdateProcedure to CatalogWriteDto to specify update operation type.
Introduced six new internal DTO classes: CatalogReadDto, CatalogWriteDto, DashboardInfoDto, LayoutDto, MassdataReadDto, and MassdataWriteDto. Each class resides in its appropriate namespace and currently contains no properties or methods, serving as placeholders for future data transfer logic.
