fix: Autenticación por token para MCP Server

- Ruta /api/mcp agregada a rutas públicas de Traefik
- Validación de token Bearer en el endpoint
- Token configurado como secret MCP_AUTH_TOKEN

pwa/sw.js

@@ -0,0 +1,49 @@
+const CACHE_NAME = 'printer-central-cache-v1';
+const urlsToCache = [
+  'index.html',
+  'manifest.json',
+  'icon.png',
+  'icons/icon-72.png',
+  'icons/icon-96.png',
+  'icons/icon-128.png',
+  'icons/icon-144.png',
+  'icons/icon-152.png',
+  'icons/icon-192.png',
+  'icons/icon-384.png',
+  'icons/icon-512.png'
+];
+
+self.addEventListener('install', event => {
+  event.waitUntil(
+    caches.open(CACHE_NAME)
+      .then(cache => {
+        return cache.addAll(urlsToCache);
+      })
+  );
+});
+
+self.addEventListener('fetch', event => {
+  event.respondWith(
+    caches.match(event.request)
+      .then(response => {
+        // Cache hit - return response
+        if (response) {
+          return response;
+        }
+        return fetch(event.request);
+      })
+  );
+});
+
+self.addEventListener('activate', event => {
+  const cacheWhitelist = [CACHE_NAME];
+  event.waitUntil(
+    caches.keys().then(keyList => {
+      return Promise.all(keyList.map(key => {
+        if (cacheWhitelist.indexOf(key) === -1) {
+          return caches.delete(key);
+        }
+      }));
+    })
+  );
+});