fix: banner translations and deployment improvements

- Add translateCarName import from i18n.ts for proper multilingual support
- Change default API language from 'ko' to 'en' for hero banners
- Add checkbox column for Local Cars banner registration
- Update Dockerfile with Playwright dependencies
- Add PostgreSQL migration script
- Add banner translation fix script

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

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

backend/requirements.txt

@@ -1,7 +1,7 @@
 fastapi
 uvicorn[standard]
 sqlalchemy
-# psycopg2-binary  # Uncomment for PostgreSQL production
+psycopg2-binary  # PostgreSQL production
 redis
 python-dotenv
 pydantic
@@ -15,6 +15,8 @@ lxml
 alembic
 email-validator
 playwright  # PDF capture for performance check reports
+img2pdf  # Convert screenshots to PDF
+pillow  # Image processing for PDF generation
 apscheduler  # Scheduled tasks (exchange rate updates)
 stripe  # Payment processing
 user-agents  # Visitor tracking