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/app/config.py

@@ -64,7 +64,10 @@ class Settings(BaseSettings):
             base_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
             db_path = os.path.join(base_dir, "autonet.db")
             return f"sqlite:///{db_path}"
-        return f"postgresql://{self.DB_USER}:{self.DB_PASSWORD}@{self.DB_HOST}:{self.DB_PORT}/{self.DB_NAME}"
+        # URL-encode password for special characters like @ # etc
+        from urllib.parse import quote_plus
+        encoded_password = quote_plus(self.DB_PASSWORD)
+        return f"postgresql://{self.DB_USER}:{encoded_password}@{self.DB_HOST}:{self.DB_PORT}/{self.DB_NAME}"
 
     @property
     def REDIS_URL(self) -> str: