dsh-plugin-onekey: One-Click Install and Uninstall Plugin for DeepSeek Harness

`dsh-plugin-onekey` is a DeepSeek Harness (DSH) plugin developed by lishLRF, designed to simplify the plugin management workflow. By intercepting the "Copy" button in the plugin center, it enables "one-click installation" without a terminal and automatic backend restart. If installation fails, it supports copying the error information with one click and sending it to an LLM for diagnosis. In addition, the plugin provides the `/卸载` command for easy uninstallation and includes a strict security whitelist validation mechanism. It is suitable for developers who need to manage plugins frequently, and it must be installed and enabled via the `dsh plugin add` command in the DSH web profile environment.