feat: quiz 빈 퀴즈셋 등록 요청시 거절 추가

backend/src/main/java/com/edufocus/edufocus/quiz/controller/QuizController.java

@@ -34,6 +34,10 @@ public class QuizController {
             , @RequestPart(value = "images", required = false) List<MultipartFile> images) throws IOException {
         long userId = Long.parseLong(jwtUtil.getUserId(accessToken));
 
+        if (quizSetCreateRequest.getQuizzes().isEmpty()) {
+            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
+        }
+
         QuizSet quizSet = quizSetService.createQuizSet(userId, quizSetCreateRequest.getTitle());
 
         int imageIdx = 0;

backend/src/main/resources/application.properties

@@ -21,7 +21,7 @@ spring.datasource.username=${USER_NAME}
 spring.datasource.password=${USER_PASSWORD}
 spring.mvc.pathmatch.matching-strategy=ant_path_matcher
 spring.jpa.database=mysql
-spring.jpa.hibernate.ddl-auto=create
+spring.jpa.hibernate.ddl-auto=update
 spring.jpa.show-sql=true  
 spring.jpa.properties.hibernate.jdbc.time_zone=Asia/Seoul
 management.endpoints.web.exposure.include=health,info