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/frontend/src/utils/admin-auth.ts

@@ -2,6 +2,7 @@ const ADMIN_TOKEN_KEY = 'order-site-admin-token'
 const ADMIN_EXPIRES_AT_KEY = 'order-site-admin-token-expires-at'
 const ADMIN_USER_ID_KEY = 'order-site-admin-user-id'
 const ADMIN_USERNAME_KEY = 'order-site-admin-username'
+const ADMIN_DISPLAY_NAME_KEY = 'order-site-admin-display-name'
 const ADMIN_ROLE_KEY = 'order-site-admin-role'
 const ADMIN_PERMISSIONS_KEY = 'order-site-admin-permissions'
 
@@ -29,6 +30,19 @@ export function getAdminUsername() {
   return localStorage.getItem(ADMIN_USERNAME_KEY) || ''
 }
 
+export function getAdminDisplayName() {
+  return localStorage.getItem(ADMIN_DISPLAY_NAME_KEY) || ''
+}
+
+export function setAdminDisplayName(displayName: string) {
+  const normalized = String(displayName || '').trim()
+  if (normalized) {
+    localStorage.setItem(ADMIN_DISPLAY_NAME_KEY, normalized)
+  } else {
+    localStorage.removeItem(ADMIN_DISPLAY_NAME_KEY)
+  }
+}
+
 export function getAdminRole() {
   const role = localStorage.getItem(ADMIN_ROLE_KEY)
   if (role === 'admin' || role === 'operator' || role === 'support' || role === 'finance') {
@@ -94,6 +108,7 @@ export function setAdminSession(
   user?: {
     userId: number
     username: string
+    displayName?: string
     role: 'admin' | 'operator' | 'support' | 'finance'
     permissions?: string[]
   },
@@ -109,6 +124,8 @@ export function setAdminSession(
     localStorage.setItem(ADMIN_USERNAME_KEY, user.username)
   }
 
+  setAdminDisplayName(user?.displayName || user?.username || '')
+
   if (user?.role) {
     localStorage.setItem(ADMIN_ROLE_KEY, user.role)
   }
@@ -121,6 +138,7 @@ export function clearAdminSession() {
   localStorage.removeItem(ADMIN_EXPIRES_AT_KEY)
   localStorage.removeItem(ADMIN_USER_ID_KEY)
   localStorage.removeItem(ADMIN_USERNAME_KEY)
+  localStorage.removeItem(ADMIN_DISPLAY_NAME_KEY)
   localStorage.removeItem(ADMIN_ROLE_KEY)
   localStorage.removeItem(ADMIN_PERMISSIONS_KEY)
 }