dsh-ios-control: Scan a QR Code on Your Phone to Remotely Control DeepSeek Harness Agent

The `dsh-ios-control` plugin for DeepSeek Harness (DSH) provides an authenticated reverse-proxy gateway on a dedicated port, addressing the security risk of the official Web UI being bound to `0.0.0.0` and the issue that `127.0.0.1` is not accessible from a mobile device. It supports features such as phone-based QR code remote control, session persistence, sub-session forking, connection keep-alive, and status monitoring. Licensed under the MIT license with zero dependencies, it allows users to securely control a locally running DSH agent through a mobile browser, while featuring HMAC authentication, device management, and MiMo mode support.