Refactor GetOrCreateEndpointCommand to ObtainEndpointCommand

Replaced `GetOrCreateEndpointCommand` with `ObtainEndpointCommand`
to improve clarity and align with naming conventions. Removed
`GetOrCreateEndpointCommand` and its handler, and introduced
`ObtainEndpointCommand` with equivalent functionality.

Updated `MappingProfile.cs` to map `ObtainEndpointCommand` to
`Endpoint`. Refactored `CreateRecActionCommand.cs` to use the
new `ObtainEndpointCommand` for retrieving or creating `Endpoint`
entities.

These changes ensure consistent naming and maintain the same
behavior while improving code readability.

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

@@ -0,0 +1,25 @@
+using DigitalData.Core.Abstraction.Application.Repository;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using ReC.Domain.Entities;
+
+namespace ReC.Application.Endpoints.Commands;
+
+public class ObtainEndpointCommand : IRequest<Endpoint>
+{
+    public string Uri { get; init; } = null!;
+}
+
+public class ObtainEndpointCommandHandler(IRepository<Endpoint> repo) : IRequestHandler<ObtainEndpointCommand, Endpoint>
+{
+    public async Task<Endpoint> Handle(ObtainEndpointCommand request, CancellationToken cancel)
+    {
+        var endpoint = await repo.Where(e => e.Uri == request.Uri).FirstOrDefaultAsync(cancel);
+
+        if (endpoint is not null)
+            return endpoint;
+
+        endpoint = await repo.CreateAsync(request, cancel);
+        return endpoint;
+    }
+}