task-31(会话/菜单/权限): 超级管理员菜单判定走角色归一

store.isSuperAdmin getter 改用 isSuperAdminRole(role) 归一判定，替代裸等值
比较；大小写/空白差异的角色串也能正确放行全部菜单。8 用例全过。

admin-frontend-vue/src/stores/admin-session.ts

@@ -1,6 +1,7 @@
 import { defineStore } from 'pinia'
 import { fetchAdminMenuTree, fetchCurrentUser, logout } from '@/api/session'
 import type { AdminMenuNode, AdminUser } from '@/types/admin'
+import { isSuperAdminRole } from '@/types/admin'
 import { firstVisiblePath } from '@/router/helpers'
 
 export const useAdminSessionStore = defineStore('admin-session', {
@@ -12,7 +13,7 @@ export const useAdminSessionStore = defineStore('admin-session', {
     error: '',
   }),
   getters: {
-    isSuperAdmin: (state) => state.user?.role === 'super_admin',
+    isSuperAdmin: (state) => isSuperAdminRole(state.user?.role),
     firstVisible: (state): string => {
       return firstVisiblePath(state.menuTree)
     },