Refactor SSH process monitoring to support VS Code forks

Extract SSH process discovery and network status display into a
dedicatedSshProcessMonitor class. Add centralized Remote SSH extension
detection to support Cursor, Windsurf, and other VS Code forks.

Key changes:

• Extract SSH monitoring logic fromremote.ts intosshProcess.ts
• AddsshExtension.ts to detect installed Remote SSH extension
• UsecreateRequire instead of privatemodule._load API to load the Remote SSH extension
• Fix port detection to find most recent port (handles reconnects)
• Add Cursor's "Socks port:" log format to port regex

Closes#284,#660