V237 - PERSISTENT ACCOUNT-BOUND MULTIPLAYER SLOTS

- Keeps the V236 LAN host and direct-IP JOIN GAME behavior.
- Multiplayer player names remain locked to the logged-in account name.
- Character slots are reserved by account name, not by BG2's temporary network player number.
- If an account disconnects, its active multiplayer character is removed from the live session.
- The account's slot reservation remains in the host session after disconnect.
- The reserved empty slot is parked on the host so a reused network player number cannot inherit it.
- The host continues to display the disconnected owner as ACCOUNTNAME / RESERVED.
- When the same account reconnects, the host gives that account its reserved slot again.
- Another account cannot create/edit a character in a slot reserved for someone else.
- Disconnect removal does NOT delete the account's CHR/BIO files.
- No automatic backups, restore copies, or respawn behavior are added.
