Refactor GetOrCreateCommand to GetOrCreateEndpointCommand

Renamed `GetOrCreateCommand` to `GetOrCreateEndpointCommand`
to improve clarity and consistency. Removed the old
`GetOrCreateCommand` class and handler, and introduced the
new `GetOrCreateEndpointCommand` class with equivalent
functionality.

Updated `MappingProfile` to reflect the new command name
and adjusted `CreateRecActionCommand` to use the renamed
command. Added the appropriate namespace for the new class
to ensure proper organization.

src/ReC.Application/Endpoints/MappingProfile.cs

@@ -7,6 +7,6 @@ public class MappingProfile : AutoMapper.Profile
 {
     public MappingProfile()
     {
-        CreateMap<GetOrCreateCommand, Endpoint>();
+        CreateMap<GetOrCreateEndpointCommand, Endpoint>();
     }
 }