JustArchiNET/ArchiSteamFarm — reverse-engineered prompt

Build me a desktop free Steam automation tool in C# that can run on Windows, Linux, or macOS and farm trading cards from multiple Steam accounts at the same time without needing the official Steam client open. I want it to feel like a real power user tool but still be easy to set up, with clear account config files, good logging, and safe handling of Steam Guard style sign in. It should support the main stuff people expect from this kind of app, like card farming, optional offline farming so friends do not see fake game activity, basic account actions such as redeeming keys or gifts, trade related actions, chat logging, and using the app as a mobile authenticator when needed.

Please make it reliable for long running use on a server, with solid error handling and reconnect behavior. If there is already a plugin system here, keep that and include the example and official plugins in a usable way. A simple web or local UI for checking status would be nice too. Look up current Steam and project docs online if you need to.