feat: LDAP 账号管理 — OU管理/添加用户/删除用户/批量导入

后端新增 4 个 LDAP 管理端点:
- POST /ldap-config/create-ou: 创建组织单元
- POST /ldap-config/create-user: 创建单个用户 (SSHA加密)
- POST /ldap-config/delete-user: 删除用户
- POST /ldap-config/batch-import-ldap: 批量导入用户
- POST /ldap-config/user-list: 查询用户列表(恢复)

前端 LdapConfigPage 增强:
- LDAP 账号管理折叠区(配置存在即显示)
- OU 下拉选择 + 根节点选项 + 数量统计
- 用户列表表格(全选/单选/DN显示)
- 新建 OU 弹框(名称+父级DN+描述)
- 添加用户弹框(用户名+密码+显示名+邮箱+目标OU)
- 删除选中用户按钮(确认后批量删除)

前端 UsersPage BatchImportModal 三 Tab:
- 本地导入 / 导入到 LDAP / 从 LDAP 导入

测试修复:
- test_user_endpoint.py: 分页格式兼容
- test_users.py: 分页格式兼容
- test_system_settings.py: 精简后配置项匹配

frontend/src/api/user.ts

@@ -1,9 +1,25 @@
 import request from './request';
 
 export const userApi = {
-  list: (params?: any) => request.get<any, any[]>('/users', { params }),
+  list: (params?: any) => request.get<any, any>('/users', { params }),
   get: (id: number) => request.get<any, any>(`/users/${id}`),
   create: (data: any) => request.post<any, any>('/users', data),
   update: (id: number, data: any) => request.put<any, any>(`/users/${id}`, data),
   delete: (id: number) => request.delete(`/users/${id}`),
+  resetPassword: (id: number, data: { new_password: string }) =>
+    request.post(`/users/${id}/reset-password`, data),
+  batchImport: (data: any) => request.post('/users/batch-import', data),
+  batchImportLdap: (data: any) => request.post('/users/batch-import-ldap', data),
+  downloadTemplate: () => request.get('/users/import-template', { responseType: 'blob' }),
+};
+
+export const ldapApi = {
+  getConfig: () => request.get('/ldap-config'),
+  updateConfig: (data: any) => request.put('/ldap-config', data),
+  testConnection: (data: any) => request.post('/ldap-config/test', data),
+  listOus: () => request.post('/ldap-config/ou-list'),
+  listUsers: (data?: any) => request.post('/ldap-config/user-list', data || {}),
+  createOu: (data: any) => request.post('/ldap-config/create-ou', data),
+  createUser: (data: any) => request.post('/ldap-config/create-user', data),
+  batchImportToLdap: (data: any) => request.post('/ldap-config/batch-import-ldap', data),
 };