feat(infrastructure): PuntoDeVentaRepository con Dapper + mapping SqlException + registro DI

src/api/SIGCM2.Infrastructure/DependencyInjection.cs

@@ -34,6 +34,7 @@ public static class DependencyInjection
         services.AddScoped<IRolPermisoRepository, RolPermisoRepository>();
         services.AddScoped<IMedioRepository, MedioRepository>();
         services.AddScoped<ISeccionRepository, SeccionRepository>();
+        services.AddScoped<IPuntoDeVentaRepository, PuntoDeVentaRepository>();
 
         // JWT Options — bound lazily via IOptions so tests can override via ConfigureWebHost
         services.Configure<JwtOptions>(configuration.GetSection("Jwt"));