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/manifest.json

@@ -0,0 +1,51 @@
+{
+  "name": "Printer Central",
+  "short_name": "Printer",
+  "description": "Manage your printers from one central app.",
+  "start_url": "index.html",
+  "display": "standalone",
+  "background_color": "#ffffff",
+  "theme_color": "#3f75d2",
+  "icons": [
+    {
+      "src": "icons/icon-72.png",
+      "sizes": "72x72",
+      "type": "image/png"
+    },
+    {
+      "src": "icons/icon-96.png",
+      "sizes": "96x96",
+      "type": "image/png"
+    },
+    {
+      "src": "icons/icon-128.png",
+      "sizes": "128x128",
+      "type": "image/png"
+    },
+    {
+      "src": "icons/icon-144.png",
+      "sizes": "144x144",
+      "type": "image/png"
+    },
+    {
+      "src": "icons/icon-152.png",
+      "sizes": "152x152",
+      "type": "image/png"
+    },
+    {
+      "src": "icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "icons/icon-384.png",
+      "sizes": "384x384",
+      "type": "image/png"
+    },
+    {
+      "src": "icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ]
+}