Add production deployment config, Alembic migration, switch to Haiku

- Production Docker Compose with Caddy reverse proxy, Gunicorn, Nginx
- Multi-stage frontend build for production
- Deploy script and automated database backup script
- Initial Alembic migration with all tables
- Switch recommendation model from Sonnet to Haiku for cost efficiency

deploy.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+set -e
+
+# Vynl production deployment script
+# Usage: ./deploy.sh [domain]
+# Example: ./deploy.sh vynl.app
+
+DOMAIN=${1:-localhost}
+
+echo "=== Deploying Vynl to ${DOMAIN} ==="
+
+# Check .env exists
+if [ ! -f backend/.env ]; then
+    echo "ERROR: backend/.env not found. Copy backend/.env.example and fill in your values."
+    exit 1
+fi
+
+# Set domain for Caddy
+export DOMAIN
+export DB_PASSWORD=$(grep POSTGRES_PASSWORD backend/.env 2>/dev/null || echo "vynl")
+
+# Build and start
+docker compose -f docker-compose.prod.yml build
+docker compose -f docker-compose.prod.yml up -d
+
+echo ""
+echo "=== Vynl deployed ==="
+echo "URL: https://${DOMAIN}"
+echo ""
+echo "Useful commands:"
+echo "  docker compose -f docker-compose.prod.yml logs -f    # View logs"
+echo "  docker compose -f docker-compose.prod.yml down       # Stop"
+echo "  docker compose -f docker-compose.prod.yml restart    # Restart"