feat(moderation): add manual content review system with three-tier AI moderation

Add admin comment moderation endpoints (single and batch) and introduce a three-tier moderation system (pass/review/block) for content flagged by AI. Content with unclear violations is now held for manual review instead of being auto-rejected. Deleted the legacy audit_service.go in favor of the unified hook-based moderation system.

internal/service/admin_comment_service.go

@@ -11,15 +11,12 @@ import (
 
 // AdminCommentService 管理端评论服务接口
 type AdminCommentService interface {
-	// GetCommentList 获取评论列表（分页、搜索、状态筛选）
 	GetCommentList(ctx context.Context, page, pageSize int, keyword, postID, authorID, status, startDate, endDate string) ([]dto.AdminCommentListResponse, int64, error)
-	// GetCommentDetail 获取评论详情
 	GetCommentDetail(ctx context.Context, commentID string) (*dto.AdminCommentDetailResponse, error)
-	// DeleteComment 删除评论
 	DeleteComment(ctx context.Context, commentID string) error
-	// BatchDeleteComments 批量删除评论
 	BatchDeleteComments(ctx context.Context, ids []string) (*dto.AdminBatchOperationResponse, error)
-	// GetCommentsByPostID 获取帖子的评论列表
+	ModerateComment(ctx context.Context, commentID string, status model.CommentStatus, reason, reviewedBy string) (*dto.AdminCommentDetailResponse, error)
+	BatchModerateComments(ctx context.Context, ids []string, status model.CommentStatus, reviewedBy string) (*dto.AdminBatchOperationResponse, error)
 	GetCommentsByPostID(ctx context.Context, postID string, page, pageSize int) ([]dto.AdminCommentListResponse, int64, error)
 }
 
@@ -103,6 +100,54 @@ func (s *adminCommentServiceImpl) BatchDeleteComments(ctx context.Context, ids [
 	}, nil
 }
 
+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 != nil {
+		return nil, err
+	}
+
+	if err := s.commentRepo.UpdateModerationStatus(commentID, status, reason, reviewedBy); err != nil {
+		return nil, err
+	}
+
+	comment, err := s.commentRepo.GetAdminCommentByID(commentID)
+	if err != nil {
+		return nil, err
+	}
+
+	return s.convertCommentToAdminDetailResponse(comment), nil
+}
+
+func (s *adminCommentServiceImpl) BatchModerateComments(ctx context.Context, ids []string, status model.CommentStatus, reviewedBy string) (*dto.AdminBatchOperationResponse, error) {
+	var failedIDs []string
+	for _, id := range ids {
+		if err := s.commentRepo.UpdateModerationStatus(id, status, "", reviewedBy); err != nil {
+			failedIDs = append(failedIDs, id)
+		}
+	}
+
+	if len(failedIDs) == 0 {
+		return &dto.AdminBatchOperationResponse{
+			Success: true,
+			Message: "批量审核成功",
+		}, nil
+	}
+
+	if len(failedIDs) == len(ids) {
+		return &dto.AdminBatchOperationResponse{
+			Success: false,
+			Message: "批量审核失败",
+			Failed:  failedIDs,
+		}, nil
+	}
+
+	return &dto.AdminBatchOperationResponse{
+		Success: true,
+		Message: "部分评论审核成功",
+		Failed:  failedIDs,
+	}, nil
+}
+
 // GetCommentsByPostID 获取帖子的评论列表
 func (s *adminCommentServiceImpl) GetCommentsByPostID(ctx context.Context, postID string, page, pageSize int) ([]dto.AdminCommentListResponse, int64, error) {
 	comments, total, err := s.commentRepo.GetCommentsByPostIDForAdmin(postID, page, pageSize)
@@ -160,6 +205,9 @@ func (s *adminCommentServiceImpl) convertCommentToAdminListResponse(comment *mod
 		Content:      comment.Content,
 		Images:       images,
 		Status:       string(comment.Status),
+		RejectReason: comment.RejectReason,
+		ReviewedAt:   dto.FormatTimePointer(comment.ReviewedAt),
+		ReviewedBy:   comment.ReviewedBy,
 		LikesCount:   comment.LikesCount,
 		RepliesCount: comment.RepliesCount,
 		CreatedAt:    comment.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
@@ -211,6 +259,9 @@ func (s *adminCommentServiceImpl) convertCommentToAdminDetailResponse(comment *m
 		Content:      comment.Content,
 		Images:       images,
 		Status:       string(comment.Status),
+		RejectReason: comment.RejectReason,
+		ReviewedAt:   dto.FormatTimePointer(comment.ReviewedAt),
+		ReviewedBy:   comment.ReviewedBy,
 		LikesCount:   comment.LikesCount,
 		RepliesCount: comment.RepliesCount,
 		CreatedAt:    comment.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),