feat(application): CRUD handlers + validators + DI de ProductType (PRD-001)

Create/Update/Deactivate handlers con TransactionScope + audit; validators FluentValidation;
DI wiring NullProductQueryRepository + 5 handlers; SqlTestFixture V017 + permiso count 25→26.

src/api/SIGCM2.Application/DependencyInjection.cs

@@ -69,6 +69,12 @@ using SIGCM2.Application.Rubros.GetById;
 using SIGCM2.Application.Rubros.Dtos;
 using SIGCM2.Application.Abstractions.Persistence;
 using SIGCM2.Application.Avisos;
+using SIGCM2.Application.Products;
+using SIGCM2.Application.ProductTypes.Create;
+using SIGCM2.Application.ProductTypes.Update;
+using SIGCM2.Application.ProductTypes.Deactivate;
+using SIGCM2.Application.ProductTypes.List;
+using SIGCM2.Application.ProductTypes.GetById;
 
 namespace SIGCM2.Application;
 
@@ -165,6 +171,16 @@ public static class DependencyInjection
         services.AddScoped<ICommandHandler<GetRubroTreeQuery, IReadOnlyList<RubroTreeNodeDto>>, GetRubroTreeQueryHandler>();
         services.AddScoped<ICommandHandler<GetRubroByIdQuery, RubroDetailDto>, GetRubroByIdQueryHandler>();
 
+        // ProductTypes (PRD-001)
+        // PRD-002 reemplaza IProductQueryRepository con implementación Dapper contra dbo.Product.
+        services.AddScoped<IProductQueryRepository, NullProductQueryRepository>();
+
+        services.AddScoped<ICommandHandler<CreateProductTypeCommand, ProductTypeCreatedDto>, CreateProductTypeCommandHandler>();
+        services.AddScoped<ICommandHandler<UpdateProductTypeCommand, ProductTypeUpdatedDto>, UpdateProductTypeCommandHandler>();
+        services.AddScoped<ICommandHandler<DeactivateProductTypeCommand, ProductTypeStatusDto>, DeactivateProductTypeCommandHandler>();
+        services.AddScoped<ICommandHandler<ListProductTypesQuery, PagedResult<ProductTypeListItemDto>>, ListProductTypesQueryHandler>();
+        services.AddScoped<ICommandHandler<GetProductTypeByIdQuery, ProductTypeDetailDto>, GetProductTypeByIdQueryHandler>();
+
         // FluentValidation validators (scans entire Application assembly)
         services.AddValidatorsFromAssemblyContaining<LoginCommandValidator>();