Removable end

• Seals The End for 48 real-time hours from the moment the config is first created and keeps it closed until an operator explicitly enables it.
• Players who reach The End while it is sealed are immediately sent back to the overworld spawn point with a message explaining that it is still locked.
• Command /removableend status reports whether The End is open and how much time remains before it can be enabled.
• Command /removableend enable (permission level 2+) unlocks The End after the 48-hour window has elapsed and broadcasts that it is open.
• Persistent state is stored in config/removableend.json; removing that file resets the 48-hour timer and lock state.

Known limitations and notes:

• Portal use cannot be prevented entirely; players may briefly load into The End before being teleported out while it is sealed.
• The lock duration counts from the first run that creates the config; deleting or moving the config restarts the countdown.

Server Validation

✅ Server validation passed - The mod was tested on a real Minecraft server and loaded successfully.