doc: update screenshots.

README-zh.md

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 文件传输和备份是「Web Serve」的另一大功能亮点。借助本地静态服务器，你可以在同一局域网内的设备之间轻松传输文件，特别适合设备间无法直接连接的情况。此外，作为一款实用的备份工具，你可以将重要文件存放在特定目录，并通过静态服务器进行访问和管理，确保数据的安全性和可用性。
 
+![Web Serve 截图 3](./assets/screenshots-3-cn.png)
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 对于物联网设备用户，「Web Serve」可以作为文件服务器，用于托管固件、配置文件或日志，方便设备在本地网络中进行访问和更新。此外，这款应用还支持数据收集，将来自多个 IoT 设备的数据存储在本地，便于后续分析。
 
 对于需要离线访问资料的用户，「Web Serve」能够托管本地的 PDF、电子书、视频教程等资料，让你随时随地通过本地服务器进行访问，特别适合在无互联网连接的环境中使用。

README.md

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 File transfer and backup are another highlight of "Web Serve." With the help of a local static server, you can easily transfer files between devices within the same local network, which is especially useful when direct connection between devices is not possible. Moreover, as a practical backup tool, you can store important files in specific directories and access and manage them via the static server, ensuring the safety and availability of your data.
 
+![Web Serve Screenshot 3](./assets/screenshots-3-cn.png)
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 For IoT device users, "Web Serve" can serve as a file server for hosting firmware, configuration files, or logs, allowing devices to access and update these files within the local network. Additionally, this application supports data collection, enabling you to store data from multiple IoT devices locally for further analysis.
 
 For users who need offline access to resources, "Web Serve" can host local PDFs, eBooks, video tutorials, and other materials, allowing you to access them anytime, anywhere through the local server, particularly in environments without internet connectivity.