fix: 修正强充订单状态映射错误，0-based DB 常量正确映射为 1-based 客户端状态

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

internal/service/client_order/service.go

@@ -749,24 +749,30 @@ func buildClientPurchaseBusinessKey(customerID uint, assetInfo *dto.AssetResolve
 }
 
 func rechargeStatusToClientStatus(status int) int {
+	// DB 使用 0-based 常量（0=待支付, 1=已支付, 2=已关闭, 3=已退款）
+	// 对外透出 1-based（与 spec 约定一致）：1=待支付, 2=已支付, 3=已关闭, 4=已退款
 	switch status {
-	case 1:
-		return 0
-	case 2, 3:
+	case model.RechargeOrderStatusPending:
 		return 1
-	default:
+	case model.RechargeOrderStatusPaid:
 		return 2
+	case model.RechargeOrderStatusClosed:
+		return 3
+	default:
+		return 4
 	}
 }
 
 func clientRechargeStatusName(clientStatus int) string {
 	switch clientStatus {
-	case 0:
-		return "待支付"
 	case 1:
+		return "待支付"
+	case 2:
 		return "已支付"
-	default:
+	case 3:
 		return "已关闭"
+	default:
+		return "已退款"
 	}
 }