feat(erp): 新增字典和分类管理功能

- 添加 dict 包，包含字体、分类和字典相关结构体与方法
- 实现分类的增删改查接口
- 实现字典的增删改查接口
- 在 receivable.go 中扩展字段支持汇率、部门、业务员等信息
- 新增 payment.go 文件，实现付款单保存功能
- 引入 time 和 decimal 包以支持日期和金额类型字段

ik3cloud/constant/constant.go

@@ -11,12 +11,14 @@ const (
 	ActionFactory       Action = "BD_Supplier"      // 工厂
 	ActionContact       Action = "BD_CommonContact" // 联系人
 	ActionCustom        Action = "BD_Customer"      // 客户
-	ActionReceivable    Action = "AR_receivable"    // 付款单
-	ActionPayable       Action = "AP_Payable"       // 付款单
+	ActionReceivable    Action = "AR_receivable"    // 应收单
+	ActionPayable       Action = "AP_Payable"       // 应付单
 	ActionProduct       Action = "BD_MATERIAL"      // 物料
 	ActionCurrency      Action = "BD_Currency"      // 币种
 	ActionSettleType    Action = "BD_SETTLETYPE"    // 结算方式
 	ActionRecPayPurpose Action = "CN_RECPAYPURPOSE" // 收付款用途
+	ActionExpense       Action = "BD_Expense"       // 费用项目
+	ActionPayment       Action = "AP_PAYBILL"       // 付款单
 )
 
 type OperatorType = string
@@ -25,3 +27,11 @@ const (
 	OperatorTypeXSY OperatorType = "XSY" // 业务员
 	OperatorTypeCGY OperatorType = "CGY" // 采购员
 )
+
+type PaymentType = string
+
+const (
+	PaymentTypePurchase PaymentType = "FKDLX09_SYS" // 采购付款单
+	PaymentTypeCost     PaymentType = "FKDLX10_SYS" // 费用付款单
+	PaymentTypeRequest  PaymentType = "FKDLX11_SYS" // 报销付款单
+)