LoginCustom Beta 4 Dev 1 - Minecraft 1.21.x

This update adds a dedicated, region-aware Folia distribution while preserving
the existing Bukkit, Paper, Velocity and BungeeCord downloads.

Highlights

Added LoginCustom-Folia.jar with Java 21 bytecode.
Uses Folia EntityScheduler for player-owned callbacks and delayed tasks.
Uses GlobalRegionScheduler for console and global work.
Database, Argon2id, Premium, network and 2FA callbacks return to the owning
player scheduler.
/logincustom doctor now reports the active platform scheduler.
The authentication timeout resets after a password is accepted when TOTP is
still required.
Removed deprecated player kick calls from modern backend flows.

Folia 1.21.11 build 14: registration, reconnect/login, reminders and timeout.
Paper 1.21.11 startup compatibility retained.
31 automated tests discovered: 30 passed and one optional external MariaDB
test was skipped.
The Folia JAR is reproducible and contains no bundled SQLite classes.

Install exactly one backend JAR. Do not place Bukkit, Paper and Folia downloads
on the same server.