chicheng-cron: DeepSeek Harness (dsh web) Scheduled Task Plugin

chicheng-cron is a scheduled task plugin for DeepSeek Harness (dsh web) aimed at integrating external scheduling tasks, such as system crontab, into the dsh web sidebar to achieve centralized configuration, execution, monitoring, and notification of tasks. The plugin supports scheduled execution for Shell, Python, Node.js scripts, as well as Skill and Agent tasks. It is compatible with standard cron expressions and various preset periods, utilizing local time calculations. Key features include integration with chicheng-push for push notifications, organizing Agent/Skill sessions into a "Scheduled Tasks" workspace with auto-archiving support, recording detailed execution history (status, duration, output, etc.), and mobile optimization. Data is stored locally at $DSH_HOME.