feat: 附件管理拆为独立tab + 员工端附件上传

管理端：
- 花名册详情新增「附件资料」独立tab（人事信息分组下）
- 从 BasicInfo 移除附件管理代码到独立 AttachmentsTab 组件
- shared.ts 添加 attachments tab 类型和计数映射

员工端：
- 后端新增 GET/POST/DELETE /portal/attachments 接口
- 前端 api-services 添加 portalDelete + 附件 API 方法
- MyProfile 新增附件资料卡片，支持上传/查看/删除附件
- 附件类型：身份证/银行卡/学历证书/职业资格证书/合同/照片/其他

frontend/src/lib/api-services.ts

@@ -1130,6 +1130,7 @@ portalAxios.interceptors.response.use(
 const portalGet = ((url: string, config?: any) => portalAxios.get(url, config)) as any
 const portalPost = ((url: string, data?: any, config?: any) => portalAxios.post(url, data, config)) as any
 const portalPut = ((url: string, data?: any, config?: any) => portalAxios.put(url, data, config)) as any
+const portalDelete = ((url: string, config?: any) => portalAxios.delete(url, config)) as any
 
 export const portalApi = {
   /** 登录 */
@@ -1198,6 +1199,15 @@ export const portalApi = {
   /** 更新个人资料 */
   updateProfile: (data: Record<string, unknown>) =>
     portalPut('/profile', data).then(unwrap<any>()),
+  /** 获取附件列表 */
+  getAttachments: () =>
+    portalGet('/attachments').then(unwrap<any[]>()),
+  /** 上传附件 */
+  addAttachment: (data: Record<string, unknown>) =>
+    portalPost('/attachments', data).then(unwrap<any>()),
+  /** 删除附件 */
+  removeAttachment: (id: string) =>
+    portalDelete(`/attachments/${id}`),
   /** 制度列表 */
   policies: () =>
     portalGet('/policies').then(unwrap<any[]>()),