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/pages/index.vue

@@ -0,0 +1,12 @@
+<script setup lang="ts">
+import HomeView from '../src/views/HomeView.vue';
+
+definePageMeta({
+  name: 'home',
+  seo: { titleKey: 'pages.home.title', descriptionKey: 'pages.home.subtitle', canonicalPath: '/' }
+});
+</script>
+
+<template>
+  <HomeView />
+</template>