feat: migrate landing from Next.js to Nuxt 4 (Vue 3)

Full 1:1 migration preserving all visuals, animations and behavior:
- Nuxt 4 + Vue 3 (script setup, TypeScript strict) with SSG output
- Tailwind CSS v4 with @tailwindcss/vite
- Ant Design Vue 4 (dark theme, RTL, Persian locale) for design system
- Pinia for state management (ui + contact stores)
- motion-v (framer-motion port) for all animations
- lucide-vue-next for icons
- SEO improvements: og:image, canonical fix, real 404 page, JSON-LD services
- JS bundle reduced from 302KB to 239KB gzip
- Docker/nginx deployment preserved (out/ -> nginx)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/components/layout/AppShell.vue

@@ -0,0 +1,24 @@
+<script setup lang="ts">
+import { AnimatePresence } from "motion-v";
+import Preloader from "./Preloader.vue";
+import Cursor from "./Cursor.vue";
+import Header from "./Header.vue";
+import BackToTop from "./BackToTop.vue";
+
+const ui = useUiStore();
+</script>
+
+<template>
+  <AnimatePresence>
+    <Preloader v-if="!ui.ready" @complete="ui.setReady" />
+  </AnimatePresence>
+
+  <Cursor />
+  <div class="noise" aria-hidden="true" />
+
+  <Header />
+
+  <slot />
+
+  <BackToTop />
+</template>