Refactor endpoint Procedures to Commands for CQRS alignment

Renamed Insert/Update/DeleteEndpointProcedure classes to their
respective Command counterparts to follow CQRS conventions.
Updated controller actions, handlers, InsertObjectProcedure,
and related unit tests to use the new Command types.
No functional changes were made; this is a naming refactor.

src/ReC.Application/Common/Procedures/InsertProcedure/InsertObjectProcedure.cs

@@ -25,7 +25,7 @@ public record InsertObjectProcedure : IRequest<long>
     internal string? AddedWho { get; private set; } = "ReC.API";
 
     public InsertActionProcedure Action { get; set; } = new();
-    public InsertEndpointProcedure Endpoint { get; set; } = new();
+    public InsertEndpointCommand Endpoint { get; set; } = new();
     public InsertEndpointAuthCommand EndpointAuth { get; set; } = new();
     public InsertProfileProcedure Profile { get; set; } = new();
     public InsertResultProcedure Result { get; set; } = new();