Add deployment guide to WEB_UI.md

Includes:
- Quick start instructions
- Environment variables
- Database configuration (with mergerfs note)
- systemd service example
- nginx reverse proxy config
- SSL setup with certbot
- Tailwind CSS build commands
- Health check and troubleshooting

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/WEB_UI.md

@@ -1303,6 +1303,153 @@ The web UI consumes these existing API endpoints:
 - Web UI strategy: `discussions/diagrams/smarttools-web-ui-strategy.puml`
 - UI visual strategy: `discussions/diagrams/smarttools-web-ui-visual-strategy.puml`
 
+## Deployment Guide
+
+### Requirements
+
+- Python 3.11+
+- pip/virtualenv
+- SQLite 3 (included with Python)
+
+### Quick Start (Development)
+
+```bash
+# Clone the repository
+git clone https://gitea.brrd.tech/rob/SmartTools.git
+cd SmartTools
+
+# Create virtual environment
+python3 -m venv venv
+source venv/bin/activate
+
+# Install with registry extras
+pip install -e ".[registry]"
+
+# Run the web server
+python -m smarttools.web.app
+```
+
+The server will start on `http://localhost:5000`.
+
+### Production Deployment
+
+#### 1. Environment Variables
+
+```bash
+# Required
+export SMARTTOOLS_REGISTRY_DB=/path/to/registry.db
+export PORT=5050
+
+# Optional
+export SMARTTOOLS_ENV=production  # Enables secure cookies
+export SMARTTOOLS_SHOW_ADS=true   # Enable ad placeholders
+```
+
+#### 2. Database Location
+
+By default, the registry uses `~/.smarttools/registry.db`. For production:
+
+```bash
+# Create dedicated directory
+mkdir -p /var/lib/smarttools
+export SMARTTOOLS_REGISTRY_DB=/var/lib/smarttools/registry.db
+```
+
+**Note**: If using a merged filesystem (e.g., mergerfs), store the database on a single disk or in `/tmp` to avoid SQLite WAL mode issues:
+
+```bash
+export SMARTTOOLS_REGISTRY_DB=/tmp/smarttools-registry/registry.db
+```
+
+#### 3. Running with systemd
+
+Create `/etc/systemd/system/smarttools-registry.service`:
+
+```ini
+[Unit]
+Description=SmartTools Registry Web Server
+After=network.target
+
+[Service]
+Type=simple
+User=smarttools
+WorkingDirectory=/opt/smarttools
+Environment=SMARTTOOLS_REGISTRY_DB=/var/lib/smarttools/registry.db
+Environment=PORT=5050
+Environment=SMARTTOOLS_ENV=production
+ExecStart=/opt/smarttools/venv/bin/python -m smarttools.web.app
+Restart=always
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target
+```
+
+```bash
+sudo systemctl daemon-reload
+sudo systemctl enable smarttools-registry
+sudo systemctl start smarttools-registry
+```
+
+#### 4. Reverse Proxy (nginx)
+
+```nginx
+server {
+    listen 80;
+    server_name registry.smarttools.dev;
+
+    location / {
+        proxy_pass http://127.0.0.1:5050;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location /static {
+        alias /opt/smarttools/src/smarttools/web/static;
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+}
+```
+
+#### 5. SSL with Certbot
+
+```bash
+sudo certbot --nginx -d registry.smarttools.dev
+```
+
+### Tailwind CSS Build
+
+The CSS is pre-built and committed. To rebuild after changes:
+
+```bash
+# Install dependencies
+npm install
+
+# Build for production
+npx tailwindcss -i src/smarttools/web/static/css/input.css \
+                -o src/smarttools/web/static/css/main.css \
+                --minify
+```
+
+### Health Check
+
+```bash
+curl http://localhost:5050/api/v1/tools
+# Returns: {"data":[],"meta":{"page":1,"per_page":20,"total":0,"total_pages":1}}
+```
+
+### Troubleshooting
+
+| Issue | Solution |
+|-------|----------|
+| `disk I/O error` | Move database to non-merged filesystem |
+| Port already in use | Change PORT environment variable |
+| 500 errors | Check `/tmp/smarttools.log` for stack traces |
+| Static files not loading | Verify static folder path in deployment |
+
 ## Future Considerations (Phase 8+)
 
 - **Forum integration**: External (Discourse) or built-in discussions