Add a new integer property "Enum_Priority" to the PurchaseRequisition data model. In EACH file, place it immediately AFTER the existing "Enum_Status" member, mirroring exactly how Enum_Status is declared in THAT file:

- Entity (PurchaseRequisition.cs) and DTO: declare `public int Enum_Priority { get; set; } = 2;` (default 2), matching the style of the Enum_Status property.
- Interface (IPurchaseRequisitionBase.cs): declare `int Enum_Priority { get; set; }` like Enum_Status.
- View models (DetailModel/GridModel) that wrap a backing _model: declare `public int Enum_Priority { get { return _model.Enum_Priority; } set { _model.Enum_Priority = value; } }`, mirroring the Enum_Status wrapper.
- Repository projection where it maps `Enum_Status = pr.Enum_Status,`: add `Enum_Priority = pr.Enum_Priority,` right after it.

Add ONLY the Enum_Priority member; change nothing else. Use the existing Enum_Status line in each file as the anchor/insertion point.
