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/Sidebar.vue

@@ -0,0 +1,59 @@
+<script setup lang="ts">
+import { ref, onMounted } from 'vue'
+import { useRouter } from 'vue-router'
+import { gql } from '@/lib/gql'
+
+const emit = defineEmits<{ close: [] }>()
+
+interface DocMeta { slug: string; title: string }
+
+const docs = ref<DocMeta[]>([])
+const router = useRouter()
+
+onMounted(async () => {
+  const data = await gql<{ documents: DocMeta[] }>(`{ documents { slug title } }`)
+  docs.value = data.documents
+})
+
+function navigate(slug: string) {
+  router.push(`/doc/${slug}`)
+  emit('close')
+}
+</script>
+
+<template>
+  <div class="flex flex-col h-full">
+    <!-- Header -->
+    <div class="flex items-center justify-between px-4 py-3 border-b border-slate-700">
+      <router-link to="/" class="font-bold text-lg" @click="emit('close')">Archivum</router-link>
+      <button class="lg:hidden p-1 rounded hover:bg-surface-700" @click="emit('close')">
+        <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
+        </svg>
+      </button>
+    </div>
+
+    <!-- Document tree -->
+    <nav class="flex-1 overflow-y-auto py-2">
+      <button
+        v-for="doc in docs"
+        :key="doc.slug"
+        class="w-full text-left px-4 py-2 text-sm hover:bg-surface-700 truncate"
+        @click="navigate(doc.slug)"
+      >
+        {{ doc.title }}
+      </button>
+    </nav>
+
+    <!-- New document button -->
+    <div class="p-3 border-t border-slate-700">
+      <router-link
+        to="/doc/new"
+        class="block w-full text-center py-2 rounded bg-blue-700 hover:bg-blue-600 text-sm font-medium"
+        @click="emit('close')"
+      >
+        + New document
+      </router-link>
+    </div>
+  </div>
+</template>