[BE] feat: 받은 리뷰 요약 조회 API 구현

backend/src/main/java/reviewme/review/controller/ReviewController.java

@@ -26,8 +26,6 @@
 @RequiredArgsConstructor
 public class ReviewController {
 
-    private static final String GROUP_ACCESS_CODE_HEADER = "GroupAccessCode";
-
     private final ReviewRegisterService reviewRegisterService;
     private final ReviewListLookupService reviewListLookupService;
     private final ReviewDetailLookupService reviewDetailLookupService;

backend/src/main/java/reviewme/review/repository/ReviewRepository.java

@@ -38,4 +38,6 @@ AND CAST(r.created_at AS DATE) <= :createdDate
     default boolean existsOlderReviewInGroup(long reviewGroupId, long reviewId, LocalDate createdDate) {
         return existsOlderReviewInGroupInLong(reviewGroupId, reviewId, createdDate) > 0;
     }
+
+    int countByReviewGroupId(long reviewGroupId);
 }

backend/src/main/java/reviewme/review/service/ReviewSummaryService.java

@@ -1,12 +1,30 @@
 package reviewme.review.service;
 
+import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
+import reviewme.review.repository.ReviewRepository;
 import reviewme.review.service.dto.response.list.ReceivedReviewsSummaryResponse;
+import reviewme.review.service.exception.ReviewGroupNotFoundByReviewRequestCodeException;
+import reviewme.reviewgroup.domain.ReviewGroup;
+import reviewme.reviewgroup.repository.ReviewGroupRepository;
 
 @Service
+@RequiredArgsConstructor
 public class ReviewSummaryService {
 
+    private final ReviewGroupRepository reviewGroupRepository;
+    private final ReviewRepository reviewRepository;
+
     public ReceivedReviewsSummaryResponse getReviewSummary(String reviewRequestCode) {
-        return null;
+        ReviewGroup reviewGroup = reviewGroupRepository.findByReviewRequestCode(reviewRequestCode)
+                .orElseThrow(() -> new ReviewGroupNotFoundByReviewRequestCodeException(reviewRequestCode));
+
+        int totalReviewCount = reviewRepository.countByReviewGroupId(reviewGroup.getId());
+
+        return new ReceivedReviewsSummaryResponse(
+                reviewGroup.getProjectName(),
+                reviewGroup.getReviewee(),
+                totalReviewCount
+        );
     }
 }