n3oltd/umbraco-extensions ? reverse-engineered prompt

Build me a set of reusable extensions for Umbraco CMS, with a demo site included so I can see how everything works together.

I want the project to support Umbraco 13 or later, and I want the extensions to feel like add ons that fit into a normal Umbraco site without forcing their own design or frontend. The main goal is to package useful backend features as NuGet packages, plus a demo web project that I can run, install through the Umbraco wizard, and then use to import the sample settings and content.

Please make it easy to understand how the pieces fit together, and include the bits needed for good integration with N3O Cloud services where that makes sense. If you need to check current Umbraco or package publishing docs online, go ahead and do that. I care more about a clean working implementation and a solid starter experience than about fancy UI.