Aktualisiere die Version auf 3.1.1 und entferne die veraltete APP_VERSION-Konstante

frontend/src/App.vue

@@ -53,10 +53,9 @@ import { computed } from 'vue'
 import StatusBox from './components/StatusBox.vue'
 import SideMenu from './components/SideMenu.vue'
 import AppBrand from './components/AppBrand.vue'
-import { APP_VERSION } from '@/config/version'
 
 const authStore = useAuthStore()
-const appVersion = APP_VERSION
+const appVersion = __APP_VERSION__
 const router = useRouter()
 const route = useRoute()
 

frontend/src/config/version.js

@@ -1,2 +0,0 @@
-/** Sichtbare Web-App-Version (synchron mit package.json). */
-export const APP_VERSION = '3.1.0'