fix(auth): 🛠 wait for any key press before exit

Replaced Enter key requirement with any key press in the authentication error handler on Windows, improving user experience when exiting after an error.

Author: caunt

src/EcoFlow.Mqtt.Api/EntryPoint.cs

@@ -26,7 +26,7 @@
     if (OperatingSystem.IsWindows())
     {
         Console.WriteLine("Press any key to exit.");
-        Console.ReadLine();
+        _ = Console.ReadKey();
     }
 
     Environment.Exit(1);