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

README.md

@@ -0,0 +1,41 @@
+# MarkdownHub
+
+Self-hosted collaborative markdown workspace.
+
+See [SPEC.md](../SPEC.md) for full specification.
+
+## Development
+
+### Backend (Go)
+```bash
+cd project
+go run ./cmd/server
+```
+
+### Frontend (Vue)
+```bash
+cd project/frontend
+npm install
+npm run dev
+```
+
+### Docker
+```bash
+cd project
+docker compose up --build
+```
+
+## Project Structure
+```
+cmd/server/       — Web server entry point
+cmd/mdsync/       — CLI sync tool
+internal/api/     — HTTP handlers & routing
+internal/db/      — SQLite connection & schema
+internal/auth/    — Authentication & sessions
+internal/files/   — File CRUD operations
+internal/git/     — Git operations (go-git)
+internal/collab/  — Yjs WebSocket relay
+internal/crypto/  — AES-256-GCM encryption
+internal/ai/      — LiteLLM integration
+frontend/         — Vue 3 SPA
+```