fix(api): 修正支付流水号标签为外部交易号

- 将字段 order.out_trade_no 的标签从“支付流水号”修改为“外部交易号”以提高准确性
- 确保前端显示的标签与实际业务含义一致
- 优化订单相关元数据的表述规范

server/internal/api/metadata.go

@@ -165,7 +165,7 @@ func marketingMetadataTables() []tableInfo {
 			Fields: []fieldInfo{
 				{Key: "order.key", Field: "key", Label: "KEY", Hidden: false},
 				{Key: "order.order_number", Field: "order_number", Label: "订单编号", Hidden: false},
-				{Key: "order.out_trade_no", Field: "out_trade_no", Label: "支付流水号", Hidden: false},
+				{Key: "order.out_trade_no", Field: "out_trade_no", Label: "外部交易号", Hidden: false},
 				{Key: "order.type", Field: "type", Label: "类型", Hidden: false},
 				{Key: "order.status", Field: "status", Label: "状态", Hidden: false},
 				{Key: "order.account", Field: "account", Label: "账号", Hidden: false},