fix(be)

Author: yeongbin1999

backend/src/main/java/com/deliveranything/global/config/WebSocketConfig.java

@@ -30,11 +30,13 @@
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
 import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
 import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
 
 @Slf4j
 @Configuration
+@EnableWebSocketMessageBroker
 @RequiredArgsConstructor
 public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {