feat: add manual fulfillment order creation

backend/internal/service/fulfillment_query.go

@@ -23,12 +23,20 @@ func (s *FulfillmentService) GetOrder(merchantID uint, orderNo string) (*model.F
 	return &order, nil
 }
 
-func (s *FulfillmentService) ListOrders(merchantID uint, page, size int, orderStatus string) ([]model.FulfillmentOrder, int64, error) {
+func (s *FulfillmentService) ListOrders(merchantID uint, page, size int, orderStatus, orderSource string) ([]model.FulfillmentOrder, int64, error) {
 	page, size = normalizePage(page, size)
 	tx := s.db.Model(&model.FulfillmentOrder{}).Where("merchant_id = ?", merchantID)
 	if orderStatus != "" {
 		tx = tx.Where("order_status = ?", orderStatus)
 	}
+	if orderSource != "" {
+		switch orderSource {
+		case model.OrderSourceAPI, model.OrderSourceManual, model.OrderSourceTest:
+			tx = tx.Where("order_source = ?", orderSource)
+		default:
+			return nil, 0, errors.New("无效的订单来源")
+		}
+	}
 	var total int64
 	if err := tx.Count(&total).Error; err != nil {
 		return nil, 0, err