Fixed hand bone rotation issue

[h1]Fixed an issue with incorrect hand bone rotation[/h1] [img]{STEAM_CLAN_IMAGE}/43757864/570b8dacd5b323cd1e9314defd4452ba99e92a66.png[/img] [h1]Performance optimizatio[/h1] Optimized MMD physics system, resulting in approximately 10~20 FPS improvement.