fix: move share quota block to download and add 3s download alert

backend/server.js

@@ -5661,9 +5661,9 @@ app.post('/api/share/:code/list', shareRateLimitMiddleware, async (req, res) =>
       shareLimiter.recordSuccess(req.shareRateLimitKey);
     }
 
-    // 获取分享者的用户信息
-    const ownerPolicyState = enforceDownloadTrafficPolicy(share.user_id, 'share_download_url');
-    const shareOwner = ownerPolicyState?.user || UserDB.findById(share.user_id);
+    // 获取分享者的用户信息（查看列表不触发下载流量策略）
+    // 仅在实际下载接口中校验和消耗下载流量，避免“可见性”受配额影响
+    const shareOwner = UserDB.findById(share.user_id);
     if (!shareOwner) {
       return res.status(404).json({
         success: false,