docs: add FAQ about user visibility in management page

Author: 夏一飞

README.md

@@ -75,6 +75,10 @@ The principle is that this address should be accessible from within the OpenWebU
 
 Fill in your deployed OpenWebUI Monitor backend domain or IP address accessible within the OpenWebUI container. For example `http://[host local ip]:7878`, where `7878` is the default port for OpenWebUI Monitor.
 
+### 3. Why can't I see users in the user management page?
+
+OpenWebUI Monitor will only start tracking a user’s information after the user makes their first chat request.
+
 <h2>Gallery</h2>
 
 ![](https://github.com/user-attachments/assets/63f23bfd-f271-41e8-a71c-2016be1d501a)

resources/tutorials/zh-cn/README_zh.md

@@ -75,6 +75,10 @@ sudo docker compose up -d
 
 填你部署的 OpenWebUI Monitor 后端域名或 OpenWebUI 容器内可访问的 ip 地址。例如 `http://[宿主机的本地ip]:7878`，其中 `7878` 是 OpenWebUI Monitor 的默认端口。
 
+### 3. 为什么用户管理页面看不见用户？
+
+只有用户首次进行聊天请求后，OpenWebUI Monitor 才会开始追踪该用户的信息。
+
 <h2>Gallery</h2>
 
 ![](https://github.com/user-attachments/assets/2777c1fc-a8c6-4397-9665-a6a559d4bab1)