T01: Frontend Foundation – Nuxt 3 + Tailwind + Design Tokens + Layout + Meta

- Nuxt 3 project with @nuxtjs/tailwindcss module
- Tailwind CSS config with A0 Dark Theme design tokens (CSS custom properties)
- AppHeader: sticky, logo, nav, phone, social icons, mobile burger menu
- AppFooter: 4-column grid (Navigation, Kontakt, Rechtliches, Social)
- HmsLogo: SVG with orange #EC6925 border
- error.vue: 404 page with Seite nicht gefunden
- robots.txt server route: Disallow: /
- Meta: noindex, nofollow, noarchive, nosnippet
- JSON-LD: LocalBusiness schema
- OpenGraph tags
- routeRules: SSR/CSR per route
- Shared components: LoadingSkeleton, EmptyState, ErrorState, LegalContentPage, SpeakerIcon
- 42 vitest tests passing
- Build: 0 errors

frontend/components/EmptyState.vue

@@ -0,0 +1,30 @@
+<template>
+  <div class="flex flex-col items-center justify-center py-12 text-center">
+    <div class="w-16 h-16 mb-4 flex items-center justify-center rounded-full bg-surface">
+      <svg class="w-8 h-8 text-secondary" fill="none" stroke="currentColor" stroke-width="1.5" viewBox="0 0 24 24" aria-hidden="true">
+        <path stroke-linecap="round" stroke-linejoin="round" d="M9 17v-6a2 2 0 012-2h2a2 2 0 012 2v6m-6 0h6m-6 0H7m14 0a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v8a2 2 0 002 2h12z"/>
+      </svg>
+    </div>
+    <h2 class="text-lg font-bold text-text mb-2">{{ title }}</h2>
+    <p class="text-text-muted text-sm mb-6 max-w-sm">{{ message }}</p>
+    <button
+      v-if="ctaText"
+      class="btn-primary"
+      @click="$emit('action')"
+    >
+      {{ ctaText }}
+    </button>
+  </div>
+</template>
+
+<script setup lang="ts">
+defineProps<{
+  title: string;
+  message: string;
+  ctaText?: string;
+}>();
+
+defineEmits<{
+  action: [];
+}>();
+</script>