JacoboAlfaro/SocialMedia2-master ? reverse-engineered prompt

Build me a simple social media backend in C# for version 1.

I want a working app where people can sign up, log in, create posts, see a feed, and interact with posts in a basic way. Please organize it cleanly so the main business logic is separate from the infrastructure and the API layer, and make sure there are unit tests and integration tests for the important flows. If you need to check current docs or best practices online, go ahead.

Use the existing solution structure and keep it practical, not overengineered. I mainly want something that feels like a real starter social media project, with a solid backend, clear models, and endpoints that are easy to understand and extend later. Please also make sure the project builds and runs without obvious setup issues, and include any missing wiring needed to connect the layers properly.