fix: 增加对话token显示，token消耗统计

Yi.Ai.Vue3/src/layouts/components/Header/components/Avatar.vue

@@ -62,6 +62,7 @@ const navItems = [
   // { name: 'permission', label: '权限管理', icon: 'Key' },
   { name: 'apiKey', label: 'API密钥', icon: 'Key' },
   { name: 'rechargeLog', label: '充值记录', icon: 'Document' },
+  { name: 'usageStatistics', label: '用量统计', icon: 'Histogram' },
 ];
 function openDialog() {
   dialogVisible.value = true;
@@ -259,6 +260,10 @@ function openVipGuide() {
       <template #user>
         <user-management />
       </template>
+      <!-- 用量统计 -->
+      <template #usageStatistics>
+        <usage-statistics />
+      </template>
 
       <!-- 角色管理内容 -->
       <template #role>