Refactor AddedWho assignment in InsertObjectProcedure

AddedWho is now set via the AddedBy method instead of direct assignment in object initializers. The property is made internal with a private setter to prevent external modification. All ToObjectProcedure methods in insert procedure records are updated to use AddedBy for consistency and encapsulation.

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

@@ -14,8 +14,7 @@ public record InsertEndpointParamsProcedure : IInsertProcedure
         return new InsertObjectProcedure
         {
             Entity = "ENDPOINT_PARAMS",
-            EndpointParams = this,
-            AddedWho = addedWho
-        };
+            EndpointParams = this
+        }.AddedBy(addedWho);
     }
 }