dsh-recovery-center: Local Plugin Recovery Points and a Standalone Emergency Recovery UI

`dsh-recovery-center` is a local plugin for DeepSeek Harness, designed to resolve white screens or system crashes caused by plugin or theme incompatibility. It enables offline recovery and version verification by saving the current plugin files, dependency manifests, and configuration. Even if the main interface is damaged, a standalone emergency page or macOS desktop entry can launch the repair process. The tool does not support Windows, does not restore chat history or the main application, but provides reversible and secure rollback capabilities for the plugin environment.