dsh-safe-launch: DeepSeek Harness Secure Launcher Plugin

Although the plugin-based architecture of DeepSeek Harness (DSH) offers strong extensibility, it also poses risks of configuration changes or upgrades disrupting the environment. The dsh-safe-launch plugin is designed to address this issue by providing five core functions: core updates, plugin compatibility checks, plugin installation, secure restarts, and more. By conducting dry runs in an isolated environment and employing rollback mechanisms, it ensures operational safety. Users can manage plugins through a Web panel or API, helping maintain the stability of DSH instances, making it suitable for developers who frequently extend functionality.