task-8(壳层/路由): 实现业务域路由注册表

新增 src/router/routes.ts：adminPages 登记业务域页面(account 首批)，routeOf 生成
路由记录，validateAdminPages 校验路径唯一/相对/含 title/load；router/index.ts 改
消费 adminRouteRecords，移除内联懒加载与路径字面量。

admin-frontend-vue/src/router/index.ts

@@ -3,6 +3,7 @@ import type { AdminMenuNode } from '@/types/admin'
 import AdminLayout from '@/layout/AdminLayout.vue'
 import { useAdminSessionStore } from '@/stores/admin-session'
 import { APP_BASE_PATH } from '@/config/app'
+import { adminRouteRecords } from './routes'
 
 const router = createRouter({
   history: createWebHistory(APP_BASE_PATH),
@@ -10,11 +11,7 @@ const router = createRouter({
     {
       path: '/',
       component: AdminLayout,
-      children: [
-        { path: 'account/users', component: () => import('@/pages/account/UsersPage.vue'), meta: { menuKey: 'admin_users', title: '用户管理' } },
-        { path: 'account/menus', component: () => import('@/pages/account/MenusPage.vue'), meta: { menuKey: 'admin_columns', title: '菜单管理' } },
-        { path: 'account/groups', component: () => import('@/pages/account/GroupsPage.vue'), meta: { menuKey: 'admin_group_manage', title: '数据权限分组' } },
-      ],
+      children: adminRouteRecords,
     },
   ],
 })