CoinFlips

Minor fixes

Refactored UpdateChecker + /cf update command

• Modrinth URL was hardcoded and incorrect. It now uses the correct endpoint /v2/project/{id}/version?limit=1.
• Modrinth ID is configurable in config.yml under update-notifier.modrinth-id.
• Added notify-console: true in config. yml to monitor console logs.
• The HTTP connection uses its own User-Agent and timeouts (5s connect / 5s read).
• New command /cf update (permission coinflips.update): launches a manual check and sends the result to the player.
• 4 new messages in messages.yml: update-notifier.checking, available, up-to-date, check-failed.
• coinflips.update permission added in plugin.yml and included in coinflips.admin.