dsh-phone-remote: Control the DSH Desktop Agent with Your Phone

The `dsh-phone-remote` plugin resolves the issue that DSH Desktop listens only on the local machine by default, allowing users to control an Agent on their computer via a mobile web page. Its main features include session management, command execution, file interaction, and real-time feedback. Users need to open the console in a desktop browser, scan a QR code with their phone to connect, and then send commands to the Agent and view the output in real time, with support for file upload and download. The plugin uses port 8790 by default, supports automatic port switching, and transmits data in plaintext. For better security, it is recommended to use an encrypted tunnel or an IP whitelist.