DeepSeek Harness (DSH) LAN Access Plugin: dsh-mobile-gateway

The `dsh-mobile-gateway` plugin resolves the issue where the official `dsh web` listens only on `127.0.0.1` by default, preventing mobile connections. It enables LAN access by overriding the configuration and mounts the `/m/api` route. The plugin provides full RPC forwarding, real-time message push, approval responses, and large image sending, with Token authentication. Users can generate a pairing QR code or configure a Token manually to connect a mobile app on the same Wi-Fi and manage DSH.