MetaMystia/MetaMystia ? reverse-engineered prompt

Build me a working mod for Touhou Mystia Izakaya that lets friends play together in co op instead of only single player.

I want the game to feel like the same little restaurant session, just shared, so players can connect, act at the same time, and help run the izakaya together. Please include the multiplayer logic, the game hooks needed for Unity and IL2CPP, and the basic setup needed to load the mod cleanly in BepInEx.

If it makes sense, also include the ResourceEx part so creators can add custom resources later. Keep it practical and make sure it’s something I can build and test from the project. If you need to check current docs or APIs online, go ahead.