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>

shared/config/site.ts

@@ -0,0 +1,42 @@
+export const siteConfig = {
+  name: "آریا ایمن",
+  nameEn: "Aria Imen Safety",
+  url: "https://ariaiman.ir", // TODO: replace with the real production domain before deploy
+  locale: "fa_IR",
+  lang: "fa",
+  dir: "rtl" as const,
+  title: "آریا ایمن | تجهیزات ایمنی و حفاظت فردی صنعتی",
+  description:
+    "آریا ایمن — تأمین‌کننده تخصصی تجهیزات حفاظت فردی (PPE)، بازرسی، آموزش و راهکارهای ایمنی صنعتی برای سازمان‌هایی که جان انسان‌ها را جدی می‌گیرند.",
+  // TODO: replace with a dedicated 1200×630 social image when available
+  ogImage: {
+    src: "/images/hero.jpg",
+    width: 1792,
+    height: 1008,
+    alt: "کارگر صنعتی با تجهیزات ایمنی کامل",
+  },
+  logo: "/images/hero.jpg", // TODO: replace with a dedicated PNG/SVG logo file when available
+  favicon: "/favicon.svg",
+  themeColor: "#0a0a0c",
+  foundingDate: "2007",
+  areaServed: "IR",
+  openingHours: {
+    days: ["Saturday", "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday"],
+    opens: "08:00",
+    closes: "17:00",
+  },
+  contact: {
+    phone: "+98-21-91008800",
+    phoneDisplay: "۰۲۱ - ۹۱ ۰۰ ۸۸ ۰۰",
+    email: "info@ariaiman.ir",
+    address: {
+      streetAddress: "خیابان کارگر شمالی، خیابان فر، کوچه دوم، پلاک ۱۲",
+      addressLocality: "تهران",
+      addressCountry: "IR",
+    },
+  },
+  socials: [] as string[], // TODO: add real social profile URLs when available
+};
+
+/** Absolute URL on the production domain. "/" → "https://domain/" (matches the sitemap entry). */
+export const absUrl = (p: string) => new URL(p, siteConfig.url).toString();