Clean up and reorganize using/import statements across the solution. Remove unnecessary DTO imports from Application and Infrastructure layers, and ensure Contracts DTOs are only referenced in API and BlazorWebApp layers. No business logic is changed; these updates improve code organization, reduce coupling, and clarify architectural separation between layers.
Upgraded AutoMapper to version 16.1.1 across API, Application, and Infrastructure projects. Removed AutoMapper.Extensions.Microsoft.DependencyInjection where no longer needed. Updated AutoMapper registration in DependencyInjection.cs to use the new API. No other changes made.
Upgraded to MediatR 14.1.0 and updated registration to use the new syntax. Removed MediatR.Extensions.Microsoft.DependencyInjection where no longer needed. Bumped Microsoft.Extensions.DependencyInjection.Abstractions to 10.0.0 in Application and Infrastructure projects.
Replaced direct service usage in CatalogsController with MediatR-based commands and queries for all CRUD operations. Added command/query and handler classes for Catalog operations. Updated dependency injection to register MediatR and removed ICatalogService. Improved code maintainability and testability by adopting CQRS architecture.
Refactored dependency injection by introducing AddApplication and AddInfrastructure extension methods for service registration. Moved DbContext and AutoMapper setup out of Program.cs to improve modularity and reusability. Added required NuGet packages to .csproj files.
