Fase 3: Soporte de Imágenes en Wizard y Backend (Upload Local)

src/SIGCM.Domain/Entities/ListingImage.cs

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+namespace SIGCM.Domain.Entities;
+
+public class ListingImage
+{
+    public int Id { get; set; }
+    public int ListingId { get; set; }
+    public required string Url { get; set; }
+    public bool IsMainInfo { get; set; }
+    public int DisplayOrder { get; set; }
+}

src/SIGCM.Domain/Interfaces/IImageRepository.cs

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+using SIGCM.Domain.Entities;
+
+namespace SIGCM.Domain.Interfaces;
+
+public interface IImageRepository
+{
+    Task AddAsync(ListingImage image);
+    Task<IEnumerable<ListingImage>> GetByListingIdAsync(int listingId);
+}