feat: Multiplayer

### Server implementation Built on [h3](https://h3.dev/) ? Make multiplayer behavior very easy to handle with a few modes : - `local` : Peer to peer through WebRTC - `server` : Websocket "Trust" should be configurable and provide some utilities ? Physic simulation should be runnable on the server. ### Build process If we want to create a client & a server bundle from one single end-to-end typed codebase, maybe we should bundle with [Rolldown](https://rolldown.rs/) or [Vite](https://vite.dev/) and implement a custom plugin to separate/generate code accordingly ? We should make sure server code stay on the server bundle.