feat: Add PWA support and CORS configuration

- Configure VitePWA with manifest, icons and service worker
- Add PwaInstallBanner component for install prompt in header
- Enable CORS for z590.interno.com access
- Use dynamic hostname for terminal WebSocket connection
- Add generate-icons script with sharp for PWA icons
- Fix theme-color to match header background

frontend/package.json

@@ -7,7 +7,8 @@
     "predev": "npm install @nucleoriofrio/webmcp@git+https://gitea.nucleoriofrio.com/nucleo000/webmcp.git --silent",
     "dev": "vite",
     "build": "vue-tsc -b && vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "generate-icons": "node scripts/generate-icons.js"
   },
   "dependencies": {
     "@nucleoriofrio/webmcp": "git+https://gitea.nucleoriofrio.com/nucleo000/webmcp.git",
@@ -23,6 +24,7 @@
     "@types/node": "^24.10.1",
     "@vitejs/plugin-vue": "^6.0.2",
     "@vue/tsconfig": "^0.8.1",
+    "sharp": "^0.34.5",
     "typescript": "~5.9.3",
     "vite": "^7.3.1",
     "vue-tsc": "^3.1.5"