V238 - RESERVED ACCOUNT SLOT WITHOUT SERVER-FULL POPUP

- Keeps the V237 LAN host + direct-IP JOIN GAME behavior.
- Keeps persistent account-bound multiplayer slots and locked account names.
- If an account disconnects, its live multiplayer character is still removed.
- The slot reservation remains bound to that account.
- V238 no longer parks the reserved empty slot on Player 1.
- Only the reservation metadata remains, so the empty reserved slot does not count
  as a live occupied seat and does not trigger the native "server full / cannot
  accept more players" popup when joining again.
- The host still shows ACCOUNTNAME / RESERVED for disconnected reserved slots.
- Reconnecting with the same account still reclaims the same reserved slot.
- No character CHR/BIO deletion, no backups, no automatic restoration.
