🩹 컨트롤러 import 추가

Author: sehee123

backend/src/main/java/io/f1/backend/domain/game/api/RoomController.java

@@ -2,6 +2,7 @@
 
 import io.f1.backend.domain.game.app.RoomService;
 import io.f1.backend.domain.game.dto.request.RoomCreateRequest;
+import io.f1.backend.domain.game.dto.response.RoomCreateResponse;
 import jakarta.validation.Valid;
 import java.util.HashMap;
 import java.util.Map;