wuzhengmao/gost-android ? reverse-engineered prompt

Build me an Android app that works as a gost client. I want a simple way to add a server config, start and stop the service, and use it to route traffic through gost on my phone. Please keep the UI clean and easy to understand, with a couple of screenshots or a basic setup flow similar to the examples in the repo.

It should support compiling a custom gost core if needed, and the app should be able to run the bundled gost binary from Android in the background. If you need to check current Android build or signing details, look up the latest docs online.

Also make sure it can be built from Android Studio, and keep the project ready for release signing with a keystore file like the one in the repo.