illacloud/illa-builder ? reverse-engineered prompt

Build me an open source low code app builder for internal business tools, something like a self hosted Retool. I want a web app where people can log in, connect a data source like MySQL or a REST API, then drag and drop components onto a canvas to make things like dashboards, admin panels, CRUD apps, and simple workflows. It should feel easy for non experts, with tables, forms, charts, and other common building blocks, plus a way to wire up actions to buttons and page events. Real time collaboration would be great, so more than one person can edit together. Include a simple way to deploy it locally or with Docker, and make the app ready for self hosting. If you need to check current docs for anything, look them up online first.