更新 AdminLayout 以显示当前用户的用户名，并引入获取用户信息的功能

src/layouts/AdminLayout.vue

@@ -56,7 +56,7 @@
         <div class="spacer" />
         <el-dropdown>
           <span class="el-dropdown-link">
-            管理员<i class="el-icon el-icon--right"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentColor" d="M7 10l5 5 5-5z"/></svg></i>
+            {{ currentUser?.username || '用户' }}<i class="el-icon el-icon--right"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentColor" d="M7 10l5 5 5-5z"/></svg></i>
           </span>
           <template #dropdown>
             <el-dropdown-menu>
@@ -78,11 +78,14 @@
 import { ref, computed } from 'vue'
 import { clearTokens } from '@/utils/auth'
 import { useRouter } from 'vue-router'
-import { canAccessRoute } from '@/utils/permission'
+import { canAccessRoute, getCurrentUser } from '@/utils/permission'
 
 const collapsed = ref(false)
 const router = useRouter()
 
+// 获取当前用户信息
+const currentUser = computed(() => getCurrentUser())
+
 // 权限检查
 const canAccessUsers = computed(() => canAccessRoute('Users'))
 const canAccessGames = computed(() => canAccessRoute('Games'))