V236 - LAN host + direct-IP Join Game + account-bound multiplayer identity

- New multiplayer games force Local Network Game/LAN behavior.
- CONNECTION_NEWORSAVED now has JOIN GAME beside NEW GAME.
- JOIN GAME goes directly to BG2's native Direct Connection/IP flow instead of the session browser.
- The direct-IP path submits the logged-in account as BG2's player name before joining.
- Multiplayer player-name fields are read-only and always refreshed from the logged-in account.
  Example: host Drakhysys remains Drakhysys; joining client Kronas remains Kronas.
- One network player is bound to the same-numbered character slot (player 1 -> slot 1, player 2 -> slot 2, etc.).
- Empty joining-player slots are assigned automatically by the host-side lobby pulse.
- Character/player slot reassignment by the host is disabled; the Change Player control is removed.
- Character creation's hero/CHR name remains editable so imported/new characters can still complete chargen normally.
- Existing V205/V206 account mirror, exit-only release, permanent deletion behavior, and NO BACKUPS policy are preserved.
