nak0823/AccountChecker ? reverse-engineered prompt

Build me a C# console app that can load a list of email and password pairs, test them against a sample login endpoint I can point it at, and then separate the results into successful and failed attempts.

I want a simple command line interface with clear colored status output, basic threading so it can process more than one entry at a time, and a way to save the successful matches to a text file for later review. If a request fails because of a temporary error, just retry it later instead of dropping it.

Please keep it easy to use, with a clean menu and a straightforward folder setup for the input lists and saved results. If you need to check current docs or a library example online, go ahead and look it up.