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/App.vue

@@ -0,0 +1,23 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import { useRouter } from 'vue-router'
+import { useAppStore } from '@/stores/app'
+import AppLayout from '@/components/layout/AppLayout.vue'
+
+const app = useAppStore()
+const router = useRouter()
+
+// If backend signals REQUIRE_SETUP, redirect to wizard.
+app.checkStatus().then(() => {
+  if (app.requiresSetup) {
+    router.replace('/setup')
+  }
+})
+
+const showLayout = computed(() => !app.requiresSetup)
+</script>
+
+<template>
+  <AppLayout v-if="showLayout" />
+  <router-view v-else />
+</template>