Mark ObtainEndpointCommand and mapping as obsolete

Mark ObtainEndpointCommand, its handler, and related mapping
profile as [Obsolete] with guidance to use the new procedure
or view-based approach. This deprecates the old command and
mapping logic in favor of updated patterns.

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

@@ -7,11 +7,13 @@ using ReC.Domain.Entities;
 
 namespace ReC.Application.Endpoints.Commands;
 
+[Obsolete("Use the related procedure or view.")]
 public class ObtainEndpointCommand : IRequest<EndpointDto>
 {
     public string Uri { get; init; } = null!;
 }
 
+[Obsolete("Use the related procedure or view.")]
 public class ObtainEndpointCommandHandler(IRepository<Endpoint> repo, IMapper mapper) : IRequestHandler<ObtainEndpointCommand, EndpointDto>
 {
     public async Task<EndpointDto> Handle(ObtainEndpointCommand request, CancellationToken cancel)

src/ReC.Application/Endpoints/MappingProfile.cs

@@ -6,6 +6,7 @@ namespace ReC.Application.Endpoints;
 // TODO: update to inject AddedWho from the current host/user contex
 public class MappingProfile : AutoMapper.Profile
 {
+    [Obsolete("Use the related procedure or view.")]
     public MappingProfile()
     {
         CreateMap<ObtainEndpointCommand, EndpointDto>()