refactor(frontend): migrate from Vite to Nuxt SPA

Replace Vite and Vue Router with Nuxt framework
Update Docker, build scripts, and env vars for Nuxt generate

frontend/plugins/01-i18n.ts

@@ -0,0 +1,5 @@
+import { i18n } from '../src/i18n';
+
+export default defineNuxtPlugin((nuxtApp) => {
+  nuxtApp.vueApp.use(i18n);
+});