Replaced String.Empty and null! with string.Empty for string properties
in CatalogReadDto, CatalogWriteDto, and VwmyCatalog classes. This
ensures consistent initialization and helps prevent null reference
issues across the codebase.
Changed default values of CatTitle, CatString, and AddedWho from null! to String.Empty to prevent potential null reference issues and ensure safer property initialization.
Replaced all usage of the Catalog entity with VwmyCatalog across application, domain, and infrastructure layers. Updated AutoMapper profiles, repository interfaces, and service logic to use VwmyCatalog. Removed the obsolete Catalog entity and related mapping profiles. Moved VwmyCatalog to the Domain.Entities namespace and cleaned up project structure. This change simplifies the domain model and eliminates redundant entity definitions.
