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/02-seo.client.ts

@@ -0,0 +1,14 @@
+import { onLocaleChange } from '../src/i18n';
+import { applyRouteSeo } from '../src/seo';
+
+export default defineNuxtPlugin(() => {
+  const router = useRouter();
+
+  router.afterEach((to) => {
+    applyRouteSeo(to);
+  });
+
+  onLocaleChange(() => {
+    applyRouteSeo(router.currentRoute.value);
+  });
+});