feat: 完善平台总后台模块

backend/api/internal/models/fin_payment.go

@@ -0,0 +1,18 @@
+package models
+
+import (
+	"git.apinb.com/bsm-sdk/core/database"
+	"time"
+)
+
+// FinPayment 对应 fin_payment，保存支付与退款记录。
+type FinPayment struct {
+	Entity
+	EcOrderID uint64     `gorm:"column:ec_order_id;not null;index" json:"ec_order_id"`
+	Channel   string     `gorm:"column:channel;type:varchar(32);not null" json:"channel"`
+	Amount    int64      `gorm:"column:amount;not null;default:0" json:"amount"`
+	PaidAt    *time.Time `gorm:"column:paid_at;type:timestamptz" json:"paid_at"`
+}
+
+func init()                                 { database.AppendMigrate(&FinPayment{}) }
+func (table *FinPayment) TableName() string { return "fin_payment" }