Updated ToObjectProcedure methods in Insert*Procedure records to use null as the default value for the addedWho parameter instead of "Rec.API". This affects InsertActionProcedure, InsertEndpointAuthProcedure, InsertEndpointParamsProcedure, InsertEndpointProcedure, and InsertProfileProcedure.
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.
Updated IInsertProcedure and all implementations to accept an optional 'addedWho' parameter in ToObjectProcedure, defaulting to "Rec.API". This enables tracking of the entity responsible for insert operations.
Refactored insert procedure-related classes by moving each record type (Action, Endpoint, EndpointAuth, Profile, Result, EndpointParams) and the IInsertProcedure interface into their own files under the new InsertProcedure namespace. Updated InsertObjectProcedureValidator to use the new namespace. This improves code organization, readability, and maintainability.
