Feat: WebSocket 의존성 추가 + WebSocketConfig 구현 (#33)

Author: jueunk617

build.gradle.kts

@@ -27,6 +27,7 @@ repositories {
 dependencies {
     implementation("org.springframework.boot:spring-boot-starter-data-jpa")
     implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.springframework.boot:spring-boot-starter-websocket")
     implementation("org.springframework.boot:spring-boot-starter-security")
     testImplementation("org.springframework.security:spring-security-test")
     compileOnly("org.projectlombok:lombok")

src/main/java/com/back/domain/websocket/config/WebSocketConfig.java

@@ -0,0 +1,36 @@
+package com.back.domain.websocket.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.messaging.simp.config.MessageBrokerRegistry;
+import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
+import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
+import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;
+
+@Configuration
+@EnableWebSocketMessageBroker
+public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
+
+    /**
+     * 메시지 브로커 설정
+     * - /topic: 1:N 브로드캐스트 (방 채팅)
+     * - /queue: 1:1 메시지 (개인 DM)
+     * - /app: 클라이언트에서 서버로 메시지 전송 시 prefix
+     */
+    @Override
+    public void configureMessageBroker(MessageBrokerRegistry config) {
+        config.enableSimpleBroker("/topic", "/queue");
+        config.setApplicationDestinationPrefixes("/app");
+        config.setUserDestinationPrefix("/user");
+    }
+
+    /**
+     * STOMP 엔드포인트 등록
+     * 클라이언트가 WebSocket 연결을 위해 사용할 엔드포인트
+     */
+    @Override
+    public void registerStompEndpoints(StompEndpointRegistry registry) {
+        registry.addEndpoint("/ws")
+                .setAllowedOriginPatterns("*") // 모든 도메인 허용 (개발용)
+                .withSockJS(); // SockJS 사용
+    }
+}