refactor(comment): unify status transitions with atomic count maintenance

Consolidate comment status changes through transitionStatus() to ensure
posts.comments_count and comments.replies_count are atomically maintained
within the same transaction, preventing inconsistencies between displayed
and stored counts.

- Remove separate ApplyPublishedStats() calls, now handled in UpdateModerationStatus
- Add cache invalidation for admin moderation operations
- Update report auto-hide to use unified status transition

internal/service/admin_comment_service.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 
+	"with_you/internal/cache"
 	"with_you/internal/dto"
 	"with_you/internal/model"
 	"with_you/internal/repository"
@@ -24,13 +25,15 @@ type AdminCommentService interface {
 type adminCommentServiceImpl struct {
 	commentRepo repository.CommentRepository
 	postRepo    repository.PostRepository
+	cache       cache.Cache
 }
 
 // NewAdminCommentService 创建管理端评论服务
-func NewAdminCommentService(commentRepo repository.CommentRepository, postRepo repository.PostRepository) AdminCommentService {
+func NewAdminCommentService(commentRepo repository.CommentRepository, postRepo repository.PostRepository, cacheBackend cache.Cache) AdminCommentService {
 	return &adminCommentServiceImpl{
 		commentRepo: commentRepo,
 		postRepo:    postRepo,
+		cache:       cacheBackend,
 	}
 }
 
@@ -101,29 +104,49 @@ func (s *adminCommentServiceImpl) BatchDeleteComments(ctx context.Context, ids [
 }
 
 func (s *adminCommentServiceImpl) ModerateComment(ctx context.Context, commentID string, status model.CommentStatus, reason, reviewedBy string) (*dto.AdminCommentDetailResponse, error) {
-	_, err := s.commentRepo.GetAdminCommentByID(commentID)
+	if _, err := s.commentRepo.GetAdminCommentByID(commentID); err != nil {
+		return nil, err
+	}
+
+	// UpdateModerationStatus 内部已原子地维护帖子评论数/父评论回复数，
+	// 因此管理端审核与自动审核路径的计数行为完全一致。
+	updated, err := s.commentRepo.UpdateModerationStatus(commentID, status, reason, reviewedBy)
 	if err != nil {
 		return nil, err
 	}
 
-	if err := s.commentRepo.UpdateModerationStatus(commentID, status, reason, reviewedBy); err != nil {
-		return nil, err
+	// 状态变更后失效该帖子相关缓存，确保前端立即看到正确计数
+	if s.cache != nil {
+		cache.InvalidatePostDetail(s.cache, updated.PostID)
+		cache.InvalidatePostList(s.cache)
 	}
 
-	comment, err := s.commentRepo.GetAdminCommentByID(commentID)
-	if err != nil {
-		return nil, err
-	}
-
-	return s.convertCommentToAdminDetailResponse(comment), nil
+	return s.convertCommentToAdminDetailResponse(updated), nil
 }
 
 func (s *adminCommentServiceImpl) BatchModerateComments(ctx context.Context, ids []string, status model.CommentStatus, reviewedBy string) (*dto.AdminBatchOperationResponse, error) {
 	var failedIDs []string
+	// 收集受影响的帖子，用于审核完成后统一失效缓存
+	affectedPostIDs := make(map[string]struct{})
+
 	for _, id := range ids {
-		if err := s.commentRepo.UpdateModerationStatus(id, status, "", reviewedBy); err != nil {
+		// UpdateModerationStatus 内部已原子地维护计数，这里只需收集结果
+		updated, err := s.commentRepo.UpdateModerationStatus(id, status, "", reviewedBy)
+		if err != nil {
 			failedIDs = append(failedIDs, id)
+			continue
 		}
+		if updated != nil {
+			affectedPostIDs[updated.PostID] = struct{}{}
+		}
+	}
+
+	// 统一失效受影响帖子的缓存
+	if s.cache != nil {
+		for postID := range affectedPostIDs {
+			cache.InvalidatePostDetail(s.cache, postID)
+		}
+		cache.InvalidatePostList(s.cache)
 	}
 
 	if len(failedIDs) == 0 {