feat: support interactive SSH port forwarding

[Adembc]

Summary

This PR introduces quick, interactive SSH port forwarding through keyboard shortcuts, eliminating the need to pre-configure forwarding rules in SSH config files. Users can now set up forwards on-demand directly from the server list.

Features

Keyboard Shortcuts

• F - Open port forwarding form for the selected server
• X - Stop all active forwards for the selected server

Forwarding Modes

• Local (-L) - Forward local port to remote destination
• Remote (-R) - Forward remote port to local destination
• Dynamic (-D) - Create SOCKS proxy

Connection Options

• Forward-only - Port forwarding without shell access (SSH -N flag)
• Forward + SSH - Port forwarding with interactive shell session

Visual Feedback

• Active forwards are clearly indicated in the server list UI
• Real-time status updates when forwards are started/stopped

Benefits

• No config changes required - Forward ports without editing SSH config
• Quick iteration - Test different port configurations instantly
• Multiple forwards - Run multiple forwards per server simultaneously
• Persistent support - Config-based forwarding still works alongside shortcuts

Screenshot