zxwk1998/vue-admin-better ? reverse-engineered prompt

Build me a modern admin dashboard template in Vue for a real business app. I want a clean login page, a left side menu, top header, tabs, and a responsive layout that works on desktop, tablet, and mobile. It should have role based access control, JWT login, and support both front end and back end controlled routes. Please include a bunch of common admin pages like user management, roles, settings, dashboard cards, tables, forms, charts, and a simple error page.

Make it feel fast and practical, with mock data where needed so I can start using it right away. I also want theme switching, multiple layouts, good loading states, and an easy way to plug in APIs. Keep the code simple and not over abstracted, since I want this to be easy to maintain and extend. If you need to check current docs for any build or library details, do that online first.