dsh-cron-job: Scheduled Tasks and Communication Plugin for DeepSeek Harness

`dsh-cron-job` is a scheduled task and multi-channel communication plugin for DeepSeek Harness. Users can configure tasks using natural language, with scheduled execution and message push supported across nine major platforms, including WeChat, Feishu, and DingTalk. The installation process is simple and supports environment proxies. The plugin provides a rigorous testing mechanism to ensure task stability, along with concurrency control and session management capabilities, delivering a complete closed-loop automated workflow.