Add PWA configuration and assets

- Install and configure @vite-pwa/nuxt module
- Generate app icons in multiple sizes (192x192, 512x512, 180x180)
- Create custom SVG icon with Nuxt + Authentik branding
- Configure PWA manifest with theme colors and display options
- Add Workbox service worker with caching strategies
- Include NetworkFirst caching for Authentik API
- Generate app store screenshots (mobile, tablet, desktop)
- Enable offline functionality and auto-updates

PWA Features:
- Installable on mobile and desktop
- Offline support with service worker
- Custom splash screens and icons
- Theme color: #00DC82 (Nuxt green)
- App name: Plantilla Nuxt + Authentik

nuxt4/package.json

@@ -21,5 +21,8 @@
     "typescript": "^5.9.3",
     "vue": "^3.5.22",
     "vue-router": "^4.5.1"
+  },
+  "devDependencies": {
+    "@vite-pwa/nuxt": "^1.0.4"
   }
 }