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/layouts/default.vue

@@ -0,0 +1,14 @@
+<template>
+  <div class="min-h-screen flex flex-col bg-bg text-text">
+    <a href="#main-content" class="skip-link">Zum Hauptinhalt springen</a>
+    <AppHeader />
+    <main id="main-content" class="flex-1 w-full max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-6">
+      <slot />
+    </main>
+    <AppFooter />
+  </div>
+</template>
+
+<script setup lang="ts">
+// Default layout – Header + Main + Footer
+</script>