Add option to make a copy of the game folder before patching (console arcs, but also generally)

For all games, it would be nice to make a backup of the game, in case the installation fails, or just so the user can play either copy.

The user can do this manually, but adding a simple "make a copy of the game folder" option should be reasonably easy

If a user wants to restore their original version (to re-patch or otherwise), they need to manually delete the game and then re-download, then re-install it.

This is especially important for the Console arcs, which share chapter 4.

We should remember to remind users that steam sync won't work on the duplicate copy/steam won't launch the duplicate copy, and any other gotchas with the other copy.

查看修补程序的主脚本，了解其如何定位和修改游戏文件夹。确定在修补开始前应在何处执行复制操作。检查现有的文件操作和错误处理，以集成备份逻辑。通过修补游戏进行测试，确保创建了副本且原始文件保持完整。

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