feat: 完善平台总后台模块

backend/api/internal/models/ec_cart.go

@@ -0,0 +1,15 @@
+package models
+
+import "git.apinb.com/bsm-sdk/core/database"
+
+// EcCart 对应 ec_cart，保存用户购物车明细。
+type EcCart struct {
+	Entity
+	UserAccountID uint64 `gorm:"column:user_account_id;not null;index" json:"user_account_id"`
+	EcProductID   uint64 `gorm:"column:ec_product_id;not null;index" json:"ec_product_id"`
+	Quantity      int    `gorm:"column:quantity;not null;default:1" json:"quantity"`
+	Selected      bool   `gorm:"column:selected;not null;default:true" json:"selected"`
+}
+
+func init()                             { database.AppendMigrate(&EcCart{}) }
+func (table *EcCart) TableName() string { return "ec_cart" }