feat: Add deployment documentation and templates (issue #12)

Created comprehensive deployment guide with:

- DEPLOYMENT.md: Full documentation covering server requirements,
  step-by-step deployment, troubleshooting, and project structure
- scripts/nginx-template.conf: Nginx configuration with SSL, reverse
  proxy to backend, and frontend static file serving
- scripts/systemd-template.service: Systemd service for auto-restart
  and environment variable management
- scripts/deploy.sh: Automated deployment script for rolling updates

deployment/scripts/deploy.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+set -e
+
+DEPLOY_DIR="/var/www/bot"
+DOMAIN="bot.yourdomain.com"
+GIT_REPO="https://git.fbrns.co/shoko/randebu.git"
+BRANCH="main"
+
+echo "=== Randebu Deployment Script ==="
+echo "Deploy directory: $DEPLOY_DIR"
+echo "Domain: $DOMAIN"
+echo ""
+
+cd "$DEPLOY_DIR"
+
+echo "[1/6] Pulling latest code..."
+git pull origin "$BRANCH"
+
+echo "[2/6] Updating backend dependencies..."
+cd "$DEPLOY_DIR/src/backend"
+source venv/bin/activate
+pip install -r requirements.txt
+
+echo "[3/6] Rebuilding frontend..."
+cd "$DEPLOY_DIR/src/frontend"
+npm install
+npm run build
+mkdir -p "$DEPLOY_DIR/frontend"
+cp -r build/* "$DEPLOY_DIR/frontend/"
+
+echo "[4/6] Restarting backend service..."
+sudo systemctl restart ave-backend
+sleep 2
+sudo systemctl status ave-backend --no-pager
+
+echo "[5/6] Testing endpoints..."
+curl -s "http://localhost:8000/health" && echo ""
+curl -s -o /dev/null -w "Frontend: %{http_code}\n" "https://$DOMAIN/" || true
+
+echo "[6/6] Verifying SSL..."
+sudo certbot certificates 2>/dev/null | grep -A2 "$DOMAIN" || echo "No certificate found for $DOMAIN"
+
+echo ""
+echo "=== Deployment Complete ==="
+echo "Backend: https://$DOMAIN/api/"
+echo "Frontend: https://$DOMAIN/"
+echo "Backend logs: sudo journalctl -u ave-backend -f"