feat(erp): 添加应收客户名称字段

- 在 Receivable 结构体中新增 RecCustomName 字段
- 该字段用于存储应收客户的名称信息
- 保持与现有 CustomName 字段的命名一致性

erp/receivable.go

@@ -44,6 +44,7 @@ type ReceivableItem struct {
 	ReceivableSerial  string          `json:"receivableSerial"`
 	BusinessDate      *time.Time      `json:"businessDate"`
 	CustomName        string          `json:"customName"`
+	RecCustomName     string          `json:"recCustomName"`
 	InvoiceSerial     string          `json:"invoiceSerial"`
 	ReceivableAmount  decimal.Decimal `json:"receivableAmount"`
 	ReceivedAmount    decimal.Decimal `json:"receivedAmount"`