feat: 完善平台总后台模块

backend/api/internal/models/ec_order_item.go

@@ -0,0 +1,16 @@
+package models
+
+import "git.apinb.com/bsm-sdk/core/database"
+
+// EcOrderItem 对应 ec_order_item，保存订单商品快照。
+type EcOrderItem struct {
+	Entity
+	EcOrderID       uint64 `gorm:"column:ec_order_id;not null;index" json:"ec_order_id"`
+	EcProductID     uint64 `gorm:"column:ec_product_id;not null;index" json:"ec_product_id"`
+	ProductSnapshot string `gorm:"column:product_snapshot;type:jsonb;not null;default:'{}'" json:"product_snapshot"`
+	Quantity        int    `gorm:"column:quantity;not null;default:1" json:"quantity"`
+	SaleAmount      int64  `gorm:"column:sale_amount;not null;default:0" json:"sale_amount"`
+}
+
+func init()                                  { database.AppendMigrate(&EcOrderItem{}) }
+func (table *EcOrderItem) TableName() string { return "ec_order_item" }