Fase 2: Gestión de Atributos Dinámicos (Back & Front EAV Definition)

src/SIGCM.Domain/Entities/AttributeDefinition.cs

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+namespace SIGCM.Domain.Entities;
+
+public class AttributeDefinition
+{
+    public int Id { get; set; }
+    public int CategoryId { get; set; }
+    public required string Name { get; set; }
+    public required string DataType { get; set; } // text, number, boolean, date
+    public bool Required { get; set; }
+}

src/SIGCM.Domain/Interfaces/IAttributeDefinitionRepository.cs

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+namespace SIGCM.Domain.Interfaces;
+using SIGCM.Domain.Entities;
+
+public interface IAttributeDefinitionRepository
+{
+    Task<IEnumerable<AttributeDefinition>> GetByCategoryIdAsync(int categoryId);
+    Task<int> AddAsync(AttributeDefinition attribute);
+    Task DeleteAsync(int id);
+}