[Feature Request]web version /option set File folder

[nenge123]

Use according to the option.ini configuration directory

such as

dir_saves = "/offline/saves"
dir_states = "/offline/sates"
dir_rooms = "/"

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indexDB, too many files are too large, and they will be read slowly, so rooms should be set not to offline. It is easy to write roms game files on demand when customizing modifications.

Indexdb has size limits, such as nds, which cannot be written if it exceeds 128MB (requires split storage)

indexDB，文件太多太大，会很缓慢读取，所以rooms应该可以设置不放在offline中。以便于自定义修改时，按需写入roms游戏文件.

indexdb存在大小限制，如nds，超过128MB就会无法写入（需要分割储存）