Feature Request: Add withdraw functionality to `polymarket bridge`

[hanguang254]

Hi Polymarket cli team,

I've been using the polymarket-cli and it's great so far! I noticed that there's currently no withdraw functionality in the CLI — deposits work well via polymarket bridge deposit, but withdrawals still require going through the web UI.

Are there any plans to add a polymarket bridge withdraw command in a future release? It would make the CLI experience much more complete, especially for users who prefer to manage everything from the terminal or via scripts.

Thanks for the great work!