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/utils/motion.ts

@@ -0,0 +1,13 @@
+export const EASE: [number, number, number, number] = [0.22, 1, 0.36, 1];
+
+/** Convert latin digits to Persian digits */
+export const faNum = (v: number | string): string =>
+  String(v).replace(/\d/g, (d) => "۰۱۲۳۴۵۶۷۸۹"[Number(d)]!);
+
+/** While-in-view fade-up props for motion elements (spread with v-bind) */
+export const fade = (delay = 0, y = 36) => ({
+  initial: { opacity: 0, y },
+  whileInView: { opacity: 1, y: 0 },
+  inViewOptions: { once: true, margin: "-60px" as const },
+  transition: { duration: 0.8, delay, ease: EASE },
+});