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>

server/routes/manifest.webmanifest.ts

@@ -0,0 +1,23 @@
+import { siteConfig } from "../../shared/config/site";
+
+export default defineEventHandler((event) => {
+  setHeader(event, "Content-Type", "application/manifest+json; charset=utf-8");
+  return {
+    name: siteConfig.name,
+    short_name: siteConfig.name,
+    lang: siteConfig.lang,
+    dir: siteConfig.dir,
+    start_url: "/",
+    display: "standalone",
+    background_color: siteConfig.themeColor,
+    theme_color: siteConfig.themeColor,
+    icons: [
+      {
+        src: siteConfig.favicon,
+        sizes: "any",
+        type: "image/svg+xml",
+        purpose: "any",
+      },
+    ],
+  };
+});

server/routes/robots.txt.ts

@@ -0,0 +1,13 @@
+import { siteConfig } from "../../shared/config/site";
+
+export default defineEventHandler((event) => {
+  setHeader(event, "Content-Type", "text/plain; charset=utf-8");
+  return [
+    "User-Agent: *",
+    "Allow: /",
+    "",
+    `Host: ${siteConfig.url}`,
+    `Sitemap: ${siteConfig.url}/sitemap.xml`,
+    "",
+  ].join("\n");
+});

server/routes/sitemap.xml.ts

@@ -0,0 +1,15 @@
+import { absUrl } from "../../shared/config/site";
+
+const pages = ["/"];
+
+export default defineEventHandler((event) => {
+  setHeader(event, "Content-Type", "application/xml; charset=utf-8");
+  const lastmod = new Date().toISOString();
+  const urls = pages
+    .map(
+      (p) =>
+        `<url>\n<loc>${absUrl(p)}</loc>\n<lastmod>${lastmod}</lastmod>\n<changefreq>monthly</changefreq>\n<priority>1</priority>\n</url>`,
+    )
+    .join("\n");
+  return `<?xml version="1.0" encoding="UTF-8"?>\n<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">\n${urls}\n</urlset>\n`;
+});