xuxueli/xxl-job ? reverse-engineered prompt

Build me a distributed job scheduling platform like XXL JOB, with a simple web dashboard where I can create, edit, pause, resume, and delete scheduled tasks. I want to be able to trigger jobs by cron, by fixed interval, by API call, or manually, and have tasks run across multiple worker machines with automatic failover and load balancing. Please include an admin app for managing jobs, users, permissions, execution history, and real time logs, plus a worker side that can register itself and pick up work automatically. It should support retrying failed jobs, timeout handling, blocking rules, and basic alerts when something fails. If it makes sense, add Docker support and a couple of sample executors so I can see how to use it right away. Keep it lightweight and easy to set up, and look up current docs online if you need to.