feat(infrastructure): ProductPriceRepository Dapper + SP invocation (PRD-003)

src/api/SIGCM2.Infrastructure/DependencyInjection.cs

@@ -43,6 +43,8 @@ public static class DependencyInjection
         services.AddScoped<IProductRepository, ProductRepository>();
         // PRD-002: replaces NullProductQueryRepository from Application DI
         services.AddScoped<IProductQueryRepository, ProductQueryRepository>();
+        // PRD-003: ProductPrices históricos
+        services.AddScoped<IProductPriceRepository, ProductPriceRepository>();
 
         // JWT Options — bound lazily via IOptions so tests can override via ConfigureWebHost
         services.Configure<JwtOptions>(configuration.GetSection("Jwt"));