perf: batch creator order list data

backend/app/services/creator.go

@@ -590,29 +590,92 @@ func (s *creator) ListOrders(
 		return nil, errorx.ErrDatabaseError.WithCause(err)
 	}
 
-	var data []creator_dto.Order
+	if len(list) == 0 {
+		return []creator_dto.Order{}, nil
+	}
+
+	// 批量加载买家、订单明细、内容，避免列表场景 N+1 查询。
+	orderIDs := make([]int64, 0, len(list))
+	userSet := make(map[int64]struct{}, len(list))
+	for _, o := range list {
+		orderIDs = append(orderIDs, o.ID)
+		if o.UserID > 0 {
+			userSet[o.UserID] = struct{}{}
+		}
+	}
+
+	userIDs := make([]int64, 0, len(userSet))
+	for id := range userSet {
+		userIDs = append(userIDs, id)
+	}
+
+	userMap := make(map[int64]*models.User, len(userIDs))
+	if len(userIDs) > 0 {
+		uTbl, uQ := models.UserQuery.QueryContext(ctx)
+		users, err := uQ.Where(uTbl.ID.In(userIDs...)).Find()
+		if err != nil {
+			return nil, errorx.ErrDatabaseError.WithCause(err)
+		}
+		for _, u := range users {
+			userMap[u.ID] = u
+		}
+	}
+
+	itemMap := make(map[int64]*models.OrderItem, len(orderIDs))
+	contentSet := make(map[int64]struct{}, len(orderIDs))
+	if len(orderIDs) > 0 {
+		itemTbl, itemQ := models.OrderItemQuery.QueryContext(ctx)
+		items, err := itemQ.Where(itemTbl.OrderID.In(orderIDs...)).
+			Order(itemTbl.OrderID.Asc(), itemTbl.ID.Asc()).
+			Find()
+		if err != nil {
+			return nil, errorx.ErrDatabaseError.WithCause(err)
+		}
+		for _, item := range items {
+			if _, exists := itemMap[item.OrderID]; exists {
+				continue
+			}
+			itemMap[item.OrderID] = item
+			if item.ContentID > 0 {
+				contentSet[item.ContentID] = struct{}{}
+			}
+		}
+	}
+
+	contentIDs := make([]int64, 0, len(contentSet))
+	for id := range contentSet {
+		contentIDs = append(contentIDs, id)
+	}
+
+	contentMap := make(map[int64]*models.Content, len(contentIDs))
+	if len(contentIDs) > 0 {
+		var contents []*models.Content
+		cTbl, cQ := models.ContentQuery.QueryContext(ctx)
+		err := cQ.Where(cTbl.ID.In(contentIDs...)).
+			UnderlyingDB().
+			Preload("ContentAssets").
+			Preload("ContentAssets.Asset").
+			Find(&contents).Error
+		if err != nil {
+			return nil, errorx.ErrDatabaseError.WithCause(err)
+		}
+		for _, c := range contents {
+			contentMap[c.ID] = c
+		}
+	}
+
+	data := make([]creator_dto.Order, 0, len(list))
 	for _, o := range list {
-		// Fetch Buyer Info
-		u, _ := models.UserQuery.WithContext(ctx).Where(models.UserQuery.ID.Eq(o.UserID)).First()
 		buyerName := "未知用户"
 		buyerAvatar := ""
-		if u != nil {
+		if u := userMap[o.UserID]; u != nil {
 			buyerName = u.Nickname
 			buyerAvatar = u.Avatar
 		}
 
-		// Fetch Content Info
 		var title, cover string
-		item, _ := models.OrderItemQuery.WithContext(ctx).Where(models.OrderItemQuery.OrderID.Eq(o.ID)).First()
-		if item != nil {
-			var c models.Content
-			err := models.ContentQuery.WithContext(ctx).
-				Where(models.ContentQuery.ID.Eq(item.ContentID)).
-				UnderlyingDB().
-				Preload("ContentAssets.Asset").
-				First(&c).Error
-
-			if err == nil {
+		if item := itemMap[o.ID]; item != nil {
+			if c := contentMap[item.ContentID]; c != nil {
 				title = c.Title
 				for _, ca := range c.ContentAssets {
 					if ca.Role == consts.ContentAssetRoleCover && ca.Asset != nil {