feat: Add packages/site — landing vitrine (Vue 3 + Tailwind 4)

- Scaffold packages/site with 11 Vue components: hero (animated terminal), features, showcase, work groups, how-it-works, security, FAQ accordion, footer
- i18n EN/FR via vue-i18n with 82+ keys, autodetect navigator.language, toggle without reload
- Animated timeline (terminal, dialog, toast) ported from design, scroll-reveal, copy buttons (2 instances)
- Self-hosted JetBrains Mono fonts (@fontsource), optimized assets (mark 28KB, og-cover 1200×630)
- SEO: canonical, og:image, theme-color, robots.txt, sitemap.xml for git-arboretum.com
- Monorepo integration (decoupled from npm release): build:site / dev:site / preview:site scripts
- CI: add build:site step to ci.yml for early detection; create .gitea/workflows/prod.yml for FTPS deploy (lftp mirror) to git-arboretum.com
- Validated builds ✓ and UI rendering (EN/FR headless test) ✓

packages/site/src/components/SecuritySection.vue

@@ -0,0 +1,47 @@
+<script setup lang="ts">
+import { useI18n } from 'vue-i18n';
+const { t } = useI18n();
+</script>
+
+<template>
+  <section id="security" class="mx-auto max-w-[1200px] scroll-mt-[84px] px-6 pb-[100px]">
+    <div
+      v-reveal
+      class="rounded-[18px] border border-emerald-500/[0.18] p-[clamp(28px,4vw,48px)]"
+      style="background: linear-gradient(180deg, rgba(16, 185, 129, 0.05), rgba(16, 185, 129, 0))"
+    >
+      <div class="mb-[30px] flex flex-wrap items-end justify-between gap-3.5">
+        <div>
+          <div class="mb-3 font-mono text-xs uppercase tracking-[0.14em] text-emerald-400">{{ t('secKicker') }}</div>
+          <h2 class="m-0 text-[clamp(26px,3.2vw,38px)] font-semibold leading-[1.12] tracking-[-0.025em] text-zinc-50">
+            {{ t('secTitle') }}
+          </h2>
+        </div>
+        <p class="m-0 max-w-[380px] text-[15.5px] leading-[1.55] text-zinc-400">{{ t('secIntro') }}</p>
+      </div>
+
+      <div class="grid grid-cols-[repeat(auto-fit,minmax(200px,1fr))] gap-3.5">
+        <div class="flex flex-col gap-2.5 rounded-[11px] border border-zinc-800 bg-[#0c0c0e] p-[18px]">
+          <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="#34d399" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect width="18" height="11" x="3" y="11" rx="2" /><path d="M7 11V7a5 5 0 0 1 10 0v4" /></svg>
+          <div class="text-[15px] font-semibold text-zinc-50">{{ t('sec1Title') }}</div>
+          <div class="text-[13.5px] leading-[1.5] text-zinc-400">{{ t('sec1Desc') }}</div>
+        </div>
+        <div class="flex flex-col gap-2.5 rounded-[11px] border border-zinc-800 bg-[#0c0c0e] p-[18px]">
+          <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="#34d399" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m15.5 7.5 2.3 2.3a1 1 0 0 0 1.4 0l2.1-2.1a1 1 0 0 0 0-1.4L19 4" /><path d="m21 2-9.6 9.6" /><circle cx="7.5" cy="15.5" r="5.5" /></svg>
+          <div class="text-[15px] font-semibold text-zinc-50">{{ t('sec2Title') }}</div>
+          <div class="text-[13.5px] leading-[1.5] text-zinc-400">{{ t('sec2Desc') }}</div>
+        </div>
+        <div class="flex flex-col gap-2.5 rounded-[11px] border border-zinc-800 bg-[#0c0c0e] p-[18px]">
+          <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="#34d399" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M20 13c0 5-3.5 7.5-7.66 8.95a1 1 0 0 1-.67-.01C7.5 20.5 4 18 4 13V6a1 1 0 0 1 1-1c2 0 4.5-1.2 6.24-2.72a1.17 1.17 0 0 1 1.52 0C14.51 3.81 17 5 19 5a1 1 0 0 1 1 1z" /><path d="m9 12 2 2 4-4" /></svg>
+          <div class="text-[15px] font-semibold text-zinc-50">{{ t('sec3Title') }}</div>
+          <div class="text-[13.5px] leading-[1.5] text-zinc-400">{{ t('sec3Desc') }}</div>
+        </div>
+        <div class="flex flex-col gap-2.5 rounded-[11px] border border-zinc-800 bg-[#0c0c0e] p-[18px]">
+          <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="#34d399" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M5 12.55a11 11 0 0 1 14.08 0" /><path d="M1.42 9a16 16 0 0 1 21.16 0" /><path d="M8.53 16.11a6 6 0 0 1 6.95 0" /><path d="M12 20h.01" /></svg>
+          <div class="text-[15px] font-semibold text-zinc-50">{{ t('sec4Title') }}</div>
+          <div class="text-[13.5px] leading-[1.5] text-zinc-400">{{ t('sec4Desc') }}</div>
+        </div>
+      </div>
+    </div>
+  </section>
+</template>