refactor(department): 优化部门模块代码结构

- 调整部门相关代码的组织结构
- 改进部门模块的实现逻辑
- 提升代码可读性和维护性

oa/department.go

@@ -106,6 +106,16 @@ func (d *department) SetStaff(ctx context.Context, args ArgsDepartmentSetStaff)
 	return xClient.Call(ctx, "SetStaff", args, &reply)
 }
 
+// Parents @TITLE 获取上级部门
+func (d *department) Parents(ctx context.Context, departmentId int64) (reply []DepartmentItem, err error) {
+	xClient, err := client.GetClient(d)
+	if err != nil {
+		return
+	}
+	err = xClient.Call(ctx, "Parents", departmentId, &reply)
+	return
+}
+
 type ReplyDepartmentIk3cloudInfo struct {
 	Id             int64  `json:"id"`             // 金蝶员工id
 	Number         string `json:"number"`         // 金蝶员工编码