Initial commit: Phase 1+2 prototype

- Go backend with SQLite, JWT auth, file CRUD
- Vue 3 frontend with split/raw/WYSIWYG editor modes
- Markdown preview (marked, GFM)
- Formatting toolbar + keyboard shortcuts
- File tree with search, create, delete
- Light/dark theme toggle
- Admin panel (user management)
- Preferences (timezone, theme, default mode)
- Shared documents section (placeholder)
- Export: PDF, HTML, MD
- Build daemon (Python, stdlib only)
- Build job queue API
- Docker deployment

docker-compose.yml

@@ -0,0 +1,13 @@
+version: "3.8"
+services:
+  markdownhub:
+    build: .
+    ports:
+      - "8090:8080"
+    volumes:
+      - ./data:/app/data
+    environment:
+      - MH_SECRET=change-me-to-random-secret
+      - MH_AI_ENDPOINT=http://litellm:4000
+      - MH_AI_API_KEY=
+    restart: unless-stopped