Feat: 세션 상태 정보/응답 DTO 추가

Author: jueunk617

src/main/java/com/back/global/websocket/dto/WebSocketSessionInfo.java

@@ -1,4 +1,20 @@
 package com.back.global.websocket.dto;
 
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
 public class WebSocketSessionInfo {
-}
+    private Long userId;
+    private String sessionId;
+    private LocalDateTime connectedAt;
+    private LocalDateTime lastActiveAt;
+    private Long currentRoomId; // 현재 참여 중인 방 ID
+}

src/main/java/com/back/global/websocket/dto/WebSocketStatusResponse.java

@@ -1,4 +1,20 @@
 package com.back.global.websocket.dto;
 
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.time.LocalDateTime;
+
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
 public class WebSocketStatusResponse {
+    private boolean isConnected;
+    private LocalDateTime connectedAt;
+    private String sessionId;
+    private Long currentRoomId;
+    private LocalDateTime lastActiveAt;
 }