VIENNA-Advantage-ERP-CRM/official-VAFramework-ERP-CRM-4.X ? reverse-engineered prompt

Build me a working open source ERP and CRM web app for a small business, inspired by Vienna Advantage.

It should let users manage customers, leads, sales, basic business records, and everyday admin tasks in one place. I want a clean web interface, login and user roles, a simple dashboard, and the core screens wired up so the app feels usable instead of just a skeleton. Keep it in C# and make it fit the existing solution structure.

Please also make sure the project builds cleanly, organize the code so it’s easy to extend, and add sensible sample data or placeholders where needed so I can see the flow quickly. If anything about the existing framework is unclear, look up current docs online if you need to and follow the existing style as closely as possible.