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>

docker/docker-compose.yml

@@ -0,0 +1,17 @@
+services:
+  archivum:
+    image: archivum:latest
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile
+    container_name: archivum
+    restart: unless-stopped
+    ports:
+      - "8080:4000"
+    volumes:
+      - ${DOCKER_PATH:-./data}/config:/config
+      - ${DOCKER_PATH:-./data}/data:/data
+    environment:
+      DOCKER_PATH: /config
+      PUID: ${PUID:-1000}
+      PGID: ${PGID:-1000}