Fase 3: Implementación de Listings (Avisos) - Entidades, Repositorio, API y Frontend Wizard integración

src/SIGCM.Domain/Entities/Listing.cs

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+namespace SIGCM.Domain.Entities;
+
+public class Listing
+{
+    public int Id { get; set; }
+    public int CategoryId { get; set; }
+    public int OperationId { get; set; }
+    public required string Title { get; set; }
+    public string? Description { get; set; }
+    public decimal Price { get; set; }
+    public string Currency { get; set; } = "ARS"; // ARS, USD
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public string Status { get; set; } = "Draft"; // Draft, Published, Sold, Paused
+    public int? UserId { get; set; }
+    
+    // Navigation properties logic will be handled manually via repositories in Dapper
+}

src/SIGCM.Domain/Entities/ListingAttributeValue.cs

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+namespace SIGCM.Domain.Entities;
+
+public class ListingAttributeValue
+{
+    public int Id { get; set; }
+    public int ListingId { get; set; }
+    public int AttributeDefinitionId { get; set; }
+    public required string Value { get; set; }
+}

src/SIGCM.Domain/Interfaces/IListingRepository.cs

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+using SIGCM.Domain.Entities;
+
+namespace SIGCM.Domain.Interfaces;
+
+public interface IListingRepository
+{
+    Task<int> CreateAsync(Listing listing, Dictionary<int, string> attributes);
+    Task<Listing?> GetByIdAsync(int id);
+    Task<IEnumerable<Listing>> GetAllAsync();
+}