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/main.ts

@@ -0,0 +1,10 @@
+import { createApp } from 'vue'
+import { createPinia } from 'pinia'
+import { router } from '@/router'
+import App from '@/App.vue'
+import '@/assets/main.css'
+
+const app = createApp(App)
+app.use(createPinia())
+app.use(router)
+app.mount('#app')