feat(application): add CQRS pipeline infrastructure and repository contracts

src/core/DigitalData.TaskFlow.Application/DependencyInjection.cs

@@ -4,6 +4,7 @@ using MediatR;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using System.Reflection;
+using DigitalData.TaskFlow.Application.Common.Behaviors;
 
 namespace DigitalData.TaskFlow.Application;
 
@@ -30,6 +31,7 @@ public static class DependencyInjection
         });
 
         services.AddValidatorsFromAssembly(typeof(DependencyInjection).Assembly);
+        services.AddTransient(typeof(IPipelineBehavior<,>), typeof(ValidationBehavior<,>));
         services.AddAutoMapper(_ => { }, Assembly.GetExecutingAssembly());
 
         return services;