feat(infrastructure): RubroRepository Dapper + DI + integration tests (CAT-001)

src/api/SIGCM2.Infrastructure/DependencyInjection.cs

@@ -38,6 +38,7 @@ public static class DependencyInjection
         services.AddScoped<IPuntoDeVentaRepository, PuntoDeVentaRepository>();
         services.AddScoped<ITipoDeIvaRepository, TipoDeIvaRepository>();
         services.AddScoped<IIngresosBrutosRepository, IngresosBrutosRepository>();
+        services.AddScoped<IRubroRepository, RubroRepository>();
 
         // JWT Options — bound lazily via IOptions so tests can override via ConfigureWebHost
         services.Configure<JwtOptions>(configuration.GetSection("Jwt"));