fix: 账户时间线入口与路由修复

- 移除账户列表下拉/卡片的时间线入口，仅保留详情弹窗顶部按钮
  - ActionDropdown 全局互斥，避免多菜单堆叠
  - 账户筛选去重，避免“未知渠道”重复泄露

src/routes/admin/usageStats.js

@@ -2133,9 +2133,14 @@ router.get('/api-keys/:keyId/usage-records', authenticateAdmin, async (req, res)
     }
 
     const accountOptions = []
+    const accountIdAdded = new Set()
     for (const option of accountOptionMap.values()) {
       const info = await resolveAccountInfo(option.id, option.accountType)
       if (info && info.name) {
+        if (accountIdAdded.has(option.id)) {
+          continue
+        }
+        accountIdAdded.add(option.id)
         accountOptions.push({
           id: option.id,
           name: info.name,