✨ feat: 룸 목록 조회 응답 DTO(RoomListResponse) 추가

- RoomResponse 추가

Author: LimKangHyun

backend/src/main/java/io/f1/backend/domain/game/dto/response/RoomListResponse.java

@@ -0,0 +1,9 @@
+package io.f1.backend.domain.game.dto.response;
+
+import java.util.List;
+
+public record RoomListResponse(
+    List<RoomResponse> rooms
+) {
+
+}

backend/src/main/java/io/f1/backend/domain/game/dto/response/RoomResponse.java

@@ -0,0 +1,17 @@
+package io.f1.backend.domain.game.dto.response;
+
+public record RoomResponse(
+    Long roomId,
+    String title,
+    int maxUserCount,
+    int currentUserCount,
+    boolean locked,
+    String roomState,
+    String quizTitle,
+    String description,
+    String creator,
+    int numberOfQuestions,
+    String thumbnailUrl
+) {
+
+}