Summary

• Add a Port input (default 22) to the Add/Edit Compute Node dialog for Direct GPU nodes
• Thread port through SSH, rsync, and WebSocket terminal connections
• Validate port range (1–65535) on both frontend and backend

Test plan

• Add a node with default port 22 — verify SSH, sync, and terminal work as before
• Add a node with a custom port — verify all operations use the correct port
• Try invalid port values (0, 99999) — verify validation error is shown