WangTingZheng/mcp940 — reverse-engineered prompt

Build me a working local Minecraft 1.12 source project from this repo. I want to open it in IntelliJ, run the client from Start.java, and actually get to the Minecraft main screen without library or native errors.

Please clean up the setup if needed, make sure the bundled jars and native files are wired correctly, and add a simple run configuration or scripts so I don’t have to manually guess VM options. Keep it on Java 8 because that seems to be what this project expects. If something needs to be downloaded, look up current docs online if you need to, but don’t upgrade the game version or rewrite the whole project.

Also check the known rough spots from the README, especially missing music and sound effects and lack of Chinese language support, and fix them if they are realistic in this codebase. At the end I just want a project I can clone, open, click run, and play the 1.12 client locally.