refactor(dto, repository): standardize pagination field names and update moderation status handling

- Changed JSON field names from "items" to "list" in various cursor pagination response DTOs for consistency.
- Updated moderation status update methods in CommentRepository and PostRepository to use UpdateColumn for better clarity and to ensure that moderation actions do not affect content update timestamps.

internal/repository/post_repo.go

@@ -114,13 +114,14 @@ func (r *PostRepository) UpdateWithImages(post *model.Post, images *[]string) er
 
 // UpdateModerationStatus 更新帖子审核状态
 func (r *PostRepository) UpdateModerationStatus(postID string, status model.PostStatus, rejectReason string, reviewedBy string) error {
+	// 审核状态更新属于管理操作，不应影响帖子内容更新时间（updated_at）
 	updates := map[string]interface{}{
 		"status":        status,
 		"reviewed_at":   gorm.Expr("CURRENT_TIMESTAMP"),
 		"reviewed_by":   reviewedBy,
 		"reject_reason": rejectReason,
 	}
-	return r.db.Model(&model.Post{}).Where("id = ?", postID).Updates(updates).Error
+	return r.db.Model(&model.Post{}).Where("id = ?", postID).UpdateColumns(updates).Error
 }
 
 // Delete 删除帖子（软删除，同时清理关联数据）
@@ -252,8 +253,9 @@ func (r *PostRepository) Like(postID, userID string) error {
 		}
 
 		// 增加帖子点赞数并同步热度分
+		// 点赞属于统计字段更新，不应影响帖子内容更新时间（updated_at）
 		return tx.Model(&model.Post{}).Where("id = ?", postID).
-			Updates(map[string]interface{}{
+			UpdateColumns(map[string]any{
 				"likes_count": gorm.Expr("likes_count + 1"),
 				"hot_score":   gorm.Expr("(likes_count + 1) * 2 + comments_count * 3 + views_count * 0.1"),
 			}).Error
@@ -269,8 +271,9 @@ func (r *PostRepository) Unlike(postID, userID string) error {
 		}
 		if result.RowsAffected > 0 {
 			// 减少帖子点赞数并同步热度分
+			// 取消点赞属于统计字段更新，不应影响帖子内容更新时间（updated_at）
 			return tx.Model(&model.Post{}).Where("id = ?", postID).
-				Updates(map[string]interface{}{
+				UpdateColumns(map[string]any{
 					"likes_count": gorm.Expr("likes_count - 1"),
 					"hot_score":   gorm.Expr("(likes_count - 1) * 2 + comments_count * 3 + views_count * 0.1"),
 				}).Error
@@ -701,14 +704,16 @@ func (r *PostRepository) BatchUpdateStatus(ids []string, status model.PostStatus
 
 // UpdatePinStatus 更新帖子置顶状态
 func (r *PostRepository) UpdatePinStatus(postID string, isPinned bool) error {
+	// 置顶状态属于管理操作，不应影响帖子内容更新时间（updated_at）
 	return r.db.Model(&model.Post{}).Where("id = ?", postID).
-		Update("is_pinned", isPinned).Error
+		UpdateColumn("is_pinned", isPinned).Error
 }
 
 // UpdateFeatureStatus 更新帖子加精状态
 func (r *PostRepository) UpdateFeatureStatus(postID string, isFeatured bool) error {
+	// 加精状态属于管理操作，不应影响帖子内容更新时间（updated_at）
 	return r.db.Model(&model.Post{}).Where("id = ?", postID).
-		Update("is_featured", isFeatured).Error
+		UpdateColumn("is_featured", isFeatured).Error
 }
 
 // ========== Cursor Pagination Methods ==========