feat: 新增客服备用金台账与后台用户中文显示名

- 新增备用金账户、流水、支出、对账与权限
- 后台用户支持中文显示名并同步备用金姓名
- 审计、登录记录、任务及工单操作人优先展示中文名
- 补充备用金与人工支出方案文档

apps/backend/src/routes/admin/users.ts

@@ -4,6 +4,7 @@ import {
   createManagedAdminUser,
   getAdminUserList,
   resetManagedAdminUserPassword,
+  updateManagedAdminUserDisplayName,
   updateManagedAdminUserRole,
   updateManagedAdminUserStatus,
 } from '../../services/admin/admin-auth-service.js'
@@ -13,6 +14,7 @@ type AdminUserMutationResult = {
   user: {
     userId: number
     username: string
+    displayName: string
     role: string
     status?: string
   }
@@ -82,6 +84,30 @@ router.post(
   ),
 )
 
+router.post(
+  '/users/:userId/display-name',
+  createJsonHandler(
+    (req) => updateManagedAdminUserDisplayName(String(req.params.userId || ''), req.body),
+    {
+      successMessage: '用户姓名已更新',
+      errorMessage: '更新用户姓名失败',
+      scope: '[admin/users/:userId/display-name]',
+      audit: (_req, data) => {
+        const result = data as AdminUserMutationResult
+        return {
+          action: 'admin_user_display_name_updated',
+          targetType: 'admin_user',
+          targetId: String(result.user.userId),
+          data: {
+            username: result.user.username,
+            displayName: result.user.displayName,
+          },
+        }
+      },
+    },
+  ),
+)
+
 router.post(
   '/users/:userId/status',
   createJsonHandler(