Revert "Merge branch 'backend-new' of https://github.com/StickMen/KungFuRhino.git"

This reverts commit c53834d0220f44dab69a9357e5d8c3e92f32b0c3, reversing
changes made to 843fe915aa3f45b4ba4ba82d2ec3449c0a5230f8.