Feat Backend ERP 1

src/SIGCM.Domain/Entities/OrderItem.cs

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+namespace SIGCM.Domain.Entities;
+
+public class OrderItem
+{
+  public int Id { get; set; }
+  public int OrderId { get; set; }
+  public int ProductId { get; set; }
+  public int CompanyId { get; set; } // Para facturación cruzada
+
+  // Vinculación polimórfica (Ej: ID del Listing que se acaba de crear)
+  public int? RelatedEntityId { get; set; }
+  public string? RelatedEntityType { get; set; } // 'Listing', 'Merchandise', 'RadioSpot'
+
+  public decimal Quantity { get; set; }
+  public decimal UnitPrice { get; set; }
+  public decimal TaxRate { get; set; }
+  public decimal SubTotal { get; set; }
+
+  public decimal CommissionPercentage { get; set; }
+  public decimal CommissionAmount { get; set; }
+
+  // Auxiliar
+  public string? ProductName { get; set; }
+}