devctl-dsh: Control DSH Sessions from Another Device via CLI

The plugin-based architecture of DSH (DeepSeek Harness) allows users to remotely control DSH sessions over a local area network via `devctl-dsh`. Core features include session management, model switching, pairing, and image sending. The controller provides a single-file Python script, `cli/dshctl.py`, and a native Android client, `dshconsole`, supporting streaming responses, interruption, workspace management, and permission control. After the plugin is installed on the controlled device, it opens an authentication port; the controller downloads and registers the service via HTTP, and when running on the same machine, it automatically reads the configuration. The Android client supports collapsible streaming thinking, mode switching, and self-healing on disconnection, making it suitable for use in a LAN environment where network security is ensured.