dsh-ssh-workspace-manager: SSH Remote Management and Deployment Plugin

`dsh-ssh-workspace-manager` is a plugin for DeepSeek Harness (DSH) designed to address the lack of host paths and context when Agents are deployed remotely. The plugin standardizes SSH functionality into two parts: a settings interface and Agent tools. **Core Features**: The settings page supports SSH host management and binding operations; Agent tools provide status querying, binding management, remote command execution, file synchronization, and container management (Compose) capabilities. **Usage Flow**: Users add and test hosts in the settings, then the Agent uses `ssh_bind` to bind the workspace to a remote server and uses `ssh_sync` to deploy it. **Notes**: Requires Node.