refactor: isolate SSE setup

README.md

@@ -132,6 +132,20 @@ docker compose down --remove-orphans
 * Arranca en puerto **80** internamente.
 * Código fuente en `ui/src/`, configuración en `vite.config.js`.
 
+### Notificaciones en tiempo real (SSE)
+
+El backend expone un endpoint `/events` que utiliza **Server-Sent Events**. La
+base de datos PostgreSQL emite mensajes mediante triggers y el servidor los
+reenvía a los navegadores conectados.
+
+```javascript
+const source = new EventSource('http://localhost:4000/events');
+source.onmessage = (e) => {
+  const data = JSON.parse(e.data);
+  console.log('Evento recibido', data);
+};
+```
+
 #### Card Animation
 The data cards implemented in `ui/src/components/ui/NucleoDataCard.vue` now feature a subtle growing animation when hovered over. This animation is implemented purely with CSS using keyframes and transitions defined within the component's `<style scoped>` section, ensuring the styles are encapsulated and don't affect other elements.