Refactor GetOrCreateCommand and add AutoMapper profile

Refactored the `GetOrCreateCommand` to simplify the creation
of `Endpoint` entities by delegating the creation logic to
`repo.CreateAsync`.

Added a new `MappingProfile` class using AutoMapper to define
mappings between command objects (`CreateEndpointCommand` and
`GetOrCreateCommand`) and the `Endpoint` entity, improving
code maintainability and reducing boilerplate.

Included necessary `using` directives in `MappingProfile.cs`
to support the new mapping functionality.

src/ReC.Application/Endpoints/Commands/GetOrCreateCommand.cs.cs

@@ -1,7 +1,6 @@
 using DigitalData.Core.Abstraction.Application.Repository;
 using MediatR;
 using Microsoft.EntityFrameworkCore;
-using ReC.Domain.Entities;
 
 namespace ReC.Application.Endpoints.Commands;
 
@@ -19,11 +18,7 @@ public class GetOrCreateCommandHandler(IRepository<Endpoint> repo) : IRequestHan
         if (endpoint is not null)
             return endpoint;
 
-        endpoint = new Endpoint
-        {
-            Uri = request.Uri
-        };
-        await repo.CreateAsync(endpoint, cancel);
+        endpoint = await repo.CreateAsync(request, cancel);
         return endpoint;
     }
 }