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/ui/SectionHead.vue

@@ -0,0 +1,42 @@
+<script setup lang="ts">
+import Reveal from "./Reveal.vue";
+
+withDefaults(
+  defineProps<{
+    tag: string;
+    /** plain-text title; use the #title slot for rich markup (line breaks, spans) */
+    title?: string;
+    desc?: string;
+    center?: boolean;
+    headingId?: string;
+  }>(),
+  { center: false },
+);
+</script>
+
+<template>
+  <div :class="center ? 'text-center' : ''">
+    <Reveal>
+      <div :class="`flex items-center gap-3 ${center ? 'justify-center' : ''}`">
+        <span class="font-mono text-sm text-accent">//</span>
+        <span class="font-mono text-xs tracking-[0.25em] text-muted">
+          {{ tag }}
+        </span>
+        <span class="h-px w-14 bg-line" />
+      </div>
+    </Reveal>
+    <Reveal :delay="0.08">
+      <h2
+        :id="headingId"
+        class="mt-5 text-3xl font-black leading-[1.25] md:text-5xl md:leading-[1.2]"
+      >
+        <slot name="title">{{ title }}</slot>
+      </h2>
+    </Reveal>
+    <Reveal v-if="desc" :delay="0.16">
+      <p :class="`mt-5 max-w-xl leading-8 text-muted ${center ? 'mx-auto' : ''}`">
+        {{ desc }}
+      </p>
+    </Reveal>
+  </div>
+</template>