feat(实体): 在字典项实体中新增描述字段并调整字段顺序

添加 description 字段以支持字典项描述信息
将 shortName 字段调整至与其他字段更合理的顺序

src/entity/dict_item.entity.ts

@@ -34,16 +34,19 @@ export class DictItem {
   @Column({ comment: '字典唯一标识名称' })
   name: string;
 
+  @Column({ nullable: true, comment: '简称' })
+  shortName: string;
+
+  @Column({ nullable: true, comment: '字典项描述' })
+  description?: string
+
   // 字典项值
   @Column({ nullable: true, comment: '字典项值' })
   value?: string;
 
   @Column({ nullable: true, comment: '图片' })
   image: string;
-
-  @Column({ nullable: true, comment: '简称' })
-  shortName: string;
-
+  
   // 排序
   @Column({ default: 0, comment: '排序' })
   sort: number;