Updated namespaces to align with the new DigitalData.Core structure, replacing `DigitalData.Core.Abstractions` with `DigitalData.Core.Application.Interfaces` and `DigitalData.Core.Client.Interface`. Removed the `IUnique<int>` interface from several DTOs, simplifying their design and altering the handling of entity identification. Updated project files to reflect new dependency versions for improved compatibility and features. Cleaned up using directives to remove obsolete references, enhancing code maintainability.
Enhanced the `Handle` method in the `ResetEmailTemplateCommandHandler` class with XML documentation comments, including a summary and detailed parameter descriptions for better code clarity and maintainability.
Introduced `ResetEmailTemplateCommand` and `ResetEmailTemplateCommandHandler`, replacing the previous `ResetEnvelopeTemplateCommand` and its handler. Updated the controller to utilize the new command, ensuring consistent mapping and command sending.
