Keep server running after tab closure

[ssbagpcm]

Description
Currently, when a browser tab containing a running CyberCoder server instance is closed, the server shuts down immediately.

Current Behavior

• Server stops when browser tab is closed
• Example: A Python web server running at https://www.cybercoder.ai/?sandbox=cr3n29 terminates upon tab closure

Requested Feature
Add functionality to keep servers running in the background even after the browser tab is closed. This would enable:

• Long-running services
• Background processes
• Continuous server operation independent of browser session

Use Case
Running persistent services like web servers or long-running scripts without requiring the browser tab to stay open.

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