TreasureRun

This alpha adds the first bounded server-hosted TreasureRun round flow while preserving the existing gameplay compatibility path.

Server-hosted flow

• One server-hosted session at a time
• Two to eight participants
• /treasurerun create, join, leave, start, stop, and status
• create, start, and stop require the operator-only treasure.admin permission
• join and leave are available while the session is waiting
• start locks the participant roster before the round begins
• A 10-second countdown runs before the round enters RUNNING
• Stop, disconnect, disable, and preparation-failure paths converge on the shared cleanup/recovery flow
• Participant return locations are persisted before teleport and cleared only after successful return

Compatibility and distribution

• The existing /gamestart compatibility path remains available
• Java 17 and Spigot 1.20.1
• MySQL remains optional and disabled by default
• ProtocolLib remains an optional soft dependency
• No ResourcePack is required for the basic flow
• Optional client-language packs are generated locally from the operator's own Minecraft 1.20.1 assets and are not distributed with TreasureRun

This is an early-alpha release. Test it on a non-production server first and keep a current world backup.