Cumeskey/dsh-ssh-remote-tunnel

DSH plugin: automatic SSH port-forward tunnel to a remote LLM/vLLM server (ping gate, any SSH client - OpenSSH ssh or PuTTY plink - with automatic password, health monitor) plus provider registration for subagent model selection. No plink required: OpenSSH ssh with password (SSH_ASKPASS/sshpass) or key auth works out of the box. DSH Desktop: settings sidebar sub-page for remote IP/port/user/credentials, SSH client path override, tunnel start/stop, and status.