Marvin-T-S/polytoria — reverse-engineered prompt

I want you to build a playable prototype of Polytoria, a 3D multiplayer game platform where people can join shared worlds and also make their own. Use the existing Godot and C# setup in this repo. The main thing I need is a basic server and client flow with synchronized players and world state, so multiple people can move around the same 3D place and see the same objects update in real time. Include a simple creator mode for building or editing a world, support Luau based scripting for game logic, and make it possible to publish or load worlds in a way that matches the idea of polytoria.com. Keep it desktop friendly for Windows, macOS, and Linux. If there are tests or docs already here, use them and fill in whatever is missing. Please get the project into a state where I can run it locally, create a world, connect two clients, and verify replication works. Look up current docs online if you need to.