[v3] Fix AuthMe login race, LocalMode port override, and incomplete deop in stand-reset

[monikon22]

Found by @Drownek testing #52 on a real stand (#46). Independent of the player-reuse rework —
worth their own small PRs rather than waiting on it.

1. AuthMe login prompt missed during handshake

auth-authme-package/index.ts: const joinIndex = player.getMessageBufferIndex() can miss the
login prompt when it arrives during the handshake, before the buffer index is read. Fix:
hardcode const joinIndex = 0.

2. LocalMode ignores the configured port

PaperProvisionTask never passes the custom port through to server.properties, so a locally
provisioned server always comes up on 25565 regardless of what the environment DSL says.

3. stand-reset.ts deop doesn't clear ability state

The raw minecraft:deop command run in stand-reset.ts removes operator status server-side but
doesn't clear player.abilities on the bot's own tracked state. Fix: await player.deOp()
instead of the raw command.