dsh-hos-scrcpy: DSH HarmonyOS Screen Mirroring Provider

DeepSeek Harness (DSH) provider plugin for the HarmonyOS platform. It connects to devices via `hdc` and provides core interaction features such as screen mirroring, touch, key events, and input. This plugin handles device connection and display management, while the UI and AI tools are provided by `dsh-scrcpy-core`. It supports multi-device use, screen rotation, rootless connection for Huawei retail devices, and image quality adjustment. Installation requires the core plugin and a DSH restart; once connected through `hdc`, screen mirroring and device control are available.