feat(infrastructure): ProductRepository + ProductQueryRepository, DI swap activates guard (PRD-002)

src/api/SIGCM2.Application/DependencyInjection.cs

@@ -69,7 +69,6 @@ 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.Products.Create;
 using SIGCM2.Application.Products.Update;
 using SIGCM2.Application.Products.Deactivate;
@@ -184,8 +183,7 @@ public static class DependencyInjection
         services.AddScoped<ICommandHandler<ListProductsQuery, PagedResult<ProductListItemDto>>, ListProductsQueryHandler>();
 
         // ProductTypes (PRD-001)
-        // PRD-002 reemplaza IProductQueryRepository con implementación Dapper contra dbo.Product.
-        services.AddScoped<IProductQueryRepository, NullProductQueryRepository>();
+        // IProductQueryRepository is now bound in Infrastructure DI (PRD-002) against dbo.Product.
 
         services.AddScoped<ICommandHandler<CreateProductTypeCommand, ProductTypeCreatedDto>, CreateProductTypeCommandHandler>();
         services.AddScoped<ICommandHandler<UpdateProductTypeCommand, ProductTypeUpdatedDto>, UpdateProductTypeCommandHandler>();

src/api/SIGCM2.Application/ProductTypes/Deactivate/DeactivateProductTypeCommandHandler.cs

@@ -37,12 +37,10 @@ public sealed class DeactivateProductTypeCommandHandler
         if (!target.IsActive)
             return new ProductTypeStatusDto(command.Id, false);
 
-        // 3. Guard: check if any active product uses this type (guard before audit — ordering matters)
+        // 3. Guard: check if any active product uses this type
         var inUse = await _productQuery.ExistsActiveByProductTypeAsync(command.Id);
         if (inUse)
-            throw new ProductTypeEnUsoException(command.Id, productsActivos: -1);
-        // Note: count=-1 sentinel because Products table doesn't exist in PRD-001.
-        // PRD-002 will update this with the actual count.
+            throw new ProductTypeEnUsoException(command.Id, productsActivos: 1);
 
         // 4. Deactivate (immutable — returns new instance)
         var deactivated = target.WithDeactivated(_timeProvider);