优化支付退款钱包链路

backend/internal/model/order.go

@@ -23,6 +23,9 @@ type RentalOrder struct {
 	Status                 string         `gorm:"size:32;not null;default:'pending_payment'" json:"status"`
 	HandoffStatus          string         `gorm:"size:32;not null;default:'none'" json:"handoff_status"`
 	SettlementStatus       string         `gorm:"size:32;not null;default:'unsettled'" json:"settlement_status"`
+	RefundStatus           string         `gorm:"size:32;not null;default:'none';index" json:"refund_status"`
+	RefundAmountCent       int64          `gorm:"not null;default:0" json:"refund_amount_cent"`
+	RefundedAt             *time.Time     `json:"refunded_at"`
 	OwnerSettledAt         *time.Time     `json:"owner_settled_at"`
 	SettledAt              *time.Time     `json:"settled_at"`
 	CreatedAt              time.Time      `json:"created_at"`

backend/internal/model/payment.go

@@ -19,6 +19,7 @@ type PaymentOrder struct {
 	PayWay          string         `gorm:"size:16;not null;default:''" json:"pay_way"`
 	JSPayFlag       string         `gorm:"column:jspay_flag;size:8;not null;default:''" json:"jspay_flag"`
 	AmountCent      int64          `gorm:"not null;default:0" json:"amount_cent"`
+	BizType         string         `gorm:"size:32;not null;default:'order_pay';index" json:"biz_type"`
 	Status          string         `gorm:"size:32;not null;default:'created';index" json:"status"`
 	TDCode          string         `gorm:"size:512;not null;default:''" json:"td_code"`
 	JSPayURL        string         `gorm:"column:jspay_url;size:512;not null;default:''" json:"jspay_url"`