fix: request 타입 수정

Author: yuseok0215

src/main/java/bitnagil/bitnagil_backend/routineV2/request/RoutineV2UpdateCompletionInfo.java

@@ -15,7 +15,7 @@ public class RoutineV2UpdateCompletionInfo {
             example = "4",
             required = true)
     @NotNull
-    private Long routineId;
+    private String routineId;
 
     @Schema(description = "메인 루틴의 완료 여부입니다.",
             example = "true",

src/main/java/bitnagil/bitnagil_backend/routineV2/service/RoutineV2Service.java

@@ -172,7 +172,8 @@ private void createRoutinesMatchedRepeatDayWithinPeriod(
     @Transactional
     public void updateRoutineCompletionStatus(User user, RoutineV2UpdateCompletionRequest request) {
         for (RoutineV2UpdateCompletionInfo info : request.getRoutineCompletionInfos()) {
-            RoutineV2 routineV2 = routineV2Repository.findByUserAndRoutineId(user, info.getRoutineId())
+            Long routineId = Long.valueOf(info.getRoutineId());
+            RoutineV2 routineV2 = routineV2Repository.findByUserAndRoutineId(user, routineId)
                 .orElseThrow(() -> new CustomException(ErrorCode.NOT_FOUND_ROUTINE));
 
             // 루틴, 서브루틴 완료 여부 갱신