dsh-llm-error-retry: Sleep Retry on LLM Request Errors

The `dsh-llm-error-retry` plugin released by DSH (DeepSeek Harness) is designed to address failures in LLM requests caused by network instability or rate limiting. It adopts a plugin-based architecture, intercepts error events, supports matching by HTTP status code, machine code, or specific response fields, and allows users to independently configure sleep duration and retry count. It provides real-time editing via a GUI, supports persistent rule configuration across restarts, and displays retry progress within the session. With zero dependencies and no build scripts, it stores data in a fixed directory, helping significantly improve the stability of automated workflows.