feat: Archivum skeleton — Go/GraphQL backend + Vue 3 PWA frontend

Full project scaffold: multi-stage Dockerfile (ARM64/AMD64), AsciiDoc↔TipTap
bridge, Setup Wizard, CodeMirror source editor, Git-backed storage layer,
LDAP+JWT auth skeleton, Tailwind mobile-first layout, and VS Code build/push
tasks targeting registry at 192.168.0.19:5000.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/layout/AppLayout.vue

@@ -0,0 +1,56 @@
+<script setup lang="ts">
+import { ref } from 'vue'
+import Sidebar from './Sidebar.vue'
+
+const sidebarOpen = ref(false)
+</script>
+
+<template>
+  <div class="flex h-screen overflow-hidden bg-surface-900 text-slate-100">
+    <!-- Mobile overlay -->
+    <transition name="fade">
+      <div
+        v-if="sidebarOpen"
+        class="fixed inset-0 z-20 bg-black/60 lg:hidden"
+        @click="sidebarOpen = false"
+      />
+    </transition>
+
+    <!-- Sidebar — slide-over on mobile, static on desktop -->
+    <aside
+      :class="[
+        'fixed inset-y-0 left-0 z-30 w-64 flex-shrink-0 bg-surface-800 border-r border-slate-700 transform transition-transform duration-200',
+        'lg:static lg:translate-x-0',
+        sidebarOpen ? 'translate-x-0' : '-translate-x-full',
+      ]"
+    >
+      <Sidebar @close="sidebarOpen = false" />
+    </aside>
+
+    <!-- Main content -->
+    <div class="flex flex-col flex-1 min-w-0 overflow-hidden">
+      <!-- Mobile top bar -->
+      <header class="flex items-center gap-3 p-3 border-b border-slate-700 lg:hidden">
+        <button
+          class="p-1.5 rounded hover:bg-surface-700"
+          aria-label="Open navigation"
+          @click="sidebarOpen = true"
+        >
+          <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 12h16M4 18h16" />
+          </svg>
+        </button>
+        <span class="font-semibold">Archivum</span>
+      </header>
+
+      <main class="flex-1 overflow-auto">
+        <router-view />
+      </main>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.fade-enter-active, .fade-leave-active { transition: opacity 0.2s; }
+.fade-enter-from, .fade-leave-to { opacity: 0; }
+</style>