Integrate Vuetify layout and routing

Add a Vuetify-powered application shell (Layout.vue) replacing the previous App.vue, including app bar, navigation drawer, theme toggle, footer and localStorage persistence for theme/drawer. Introduce a routesLayout plugin with a Visibility enum and centralized LayoutRoute definitions; add route components (Home, Impressum, Login, 404NotFound) and update the router to build routes from the new layout definitions. Register Vuetify in main.ts and add dependencies (vuetify, @fontsource/roboto, @mdi/font) in package.json; update tsconfig.app.json to include .ts files. Package-lock.json updated accordingly.

GUI/package.json

@@ -12,9 +12,12 @@
     "format": "prettier --write --experimental-cli src/"
   },
   "dependencies": {
+    "@fontsource/roboto": "^5.2.10",
+    "@mdi/font": "^7.4.47",
     "pinia": "^3.0.4",
     "vue": "^3.5.31",
-    "vue-router": "^5.0.4"
+    "vue-router": "^5.0.4",
+    "vuetify": "^4.0.5"
   },
   "devDependencies": {
     "@tsconfig/node24": "^24.0.4",