feat: integrate unified payment and wallet refunds

backend/api/internal/models/gasorder_payment.go

@@ -6,7 +6,7 @@ import "git.apinb.com/bsm-sdk/core/database"
 type GasorderPayment struct {
 	Entity                 // 公共实体字段，Status 保存支付尝试状态
 	GasorderBasicID uint64 `gorm:"column:gasorder_basic_id;not null;index;uniqueIndex:idx_gasorder_payment_attempt" json:"gasorder_basic_id"` // 订单自增主键
-	WalletPaymentID uint64 `gorm:"column:wallet_payment_id;not null;uniqueIndex" json:"wallet_payment_id"`                                    // 钱包支付记录自增主键
+	PaymentOrderID  uint64 `gorm:"column:payment_order_id;not null;uniqueIndex" json:"payment_order_id"`                                      // 钱包支付记录自增主键
 	AttemptNo       int    `gorm:"column:attempt_no;not null;uniqueIndex:idx_gasorder_payment_attempt" json:"attempt_no"`                     // 支付尝试序号
 	Amount          int64  `gorm:"column:amount;not null;check:amount > 0" json:"amount"`                                                     // 支付金额，单位分
 }