feat(menu-store): 添加一级菜单活跃状态管理

新增 activeTopMenuPath 状态及相关函数，支持两级菜单结构下的
一级菜单高亮追踪，保持与现有菜单状态的向后兼容。

Co-authored-by: Cursor <cursoragent@cursor.com>

web-admin/src/store/modules/menu.ts

@@ -47,6 +47,8 @@ export const useMenuStore = defineStore('menuStore', () => {
   const menuWidth = ref('')
   /** 存储路由移除函数的数组 */
   const removeRouteFns = ref<(() => void)[]>([])
+  /** 活跃的一级菜单路径 */
+  const activeTopMenuPath = ref('')
 
   /**
    * 设置菜单列表
@@ -95,15 +97,32 @@ export const useMenuStore = defineStore('menuStore', () => {
     removeRouteFns.value = []
   }
 
+  /**
+   * 设置活跃一级菜单路径
+   * @param path 菜单路径
+   */
+  const setActiveTopMenuPath = (path: string) => {
+    activeTopMenuPath.value = path
+  }
+
+  /**
+   * 获取活跃一级菜单路径
+   * @returns 菜单路径字符串
+   */
+  const getActiveTopMenuPath = () => activeTopMenuPath.value
+
   return {
     menuList,
     menuWidth,
     removeRouteFns,
+    activeTopMenuPath,
     setMenuList,
     getHomePath,
     setHomePath,
     addRemoveRouteFns,
     removeAllDynamicRoutes,
-    clearRemoveRouteFns
+    clearRemoveRouteFns,
+    setActiveTopMenuPath,
+    getActiveTopMenuPath,
   }
 })