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

src/SIGCM.Infrastructure/Repositories/ImageRepository.cs

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+using Dapper;
+using SIGCM.Domain.Entities;
+using SIGCM.Domain.Interfaces;
+using SIGCM.Infrastructure.Data;
+
+namespace SIGCM.Infrastructure.Repositories;
+
+public class ImageRepository : IImageRepository
+{
+    private readonly IDbConnectionFactory _connectionFactory;
+
+    public ImageRepository(IDbConnectionFactory connectionFactory)
+    {
+        _connectionFactory = connectionFactory;
+    }
+
+    public async Task AddAsync(ListingImage image)
+    {
+        using var conn = _connectionFactory.CreateConnection();
+        var sql = @"
+            INSERT INTO ListingImages (ListingId, Url, IsMainInfo, DisplayOrder)
+            VALUES (@ListingId, @Url, @IsMainInfo, @DisplayOrder)";
+        await conn.ExecuteAsync(sql, image);
+    }
+
+    public async Task<IEnumerable<ListingImage>> GetByListingIdAsync(int listingId)
+    {
+        using var conn = _connectionFactory.CreateConnection();
+        return await conn.QueryAsync<ListingImage>(
+            "SELECT * FROM ListingImages WHERE ListingId = @ListingId ORDER BY DisplayOrder", 
+            new { ListingId = listingId });
+    }
+}