Add a new /tryout command as an extensible entry point for recommended feature trials, with /tryout tui as the first action. The command updates [Console.General] ConsoleMode to "tui", writes the config back immediately, and explains both how to revert the change and that a restart is required.
Also show a startup recommendation in classic console mode when stdin is interactive, so users can discover the TUI experience without manually editing MinecraftClient.ini. All user-facing text is routed through the translation resources.
