- Fix build.gradle.kts: Java 21, Paper 1.20.6, ProtocolLib 5.3.0
- Add permissions to paper-plugin.yml
- Add ConfigManager with safe yaml loading (no overwrite)
- Add LocationsConfig for all game object coordinates
- Add GameConfig with all balance values
- Update mdbd.java with onEnable/onDisable + ConfigManager
- Mark Stage 0 complete in PLAN.md