V311 - LOCAL MULTIPLAYER MENU CHANGES

Run SETUP_IN_GAME_ACCOUNTS.bat (the single installer). Close BG2 first.

Host name: Baldur's Gate 2 Online Server replaces the old SoA-1 default
and the old Baldur's Gate 2 Game default. Manually customized names remain.
LAN is preselected and locked; password protection is disabled.
Joining via the in-game Join Game button attempts native TCP/IP to the
previously selected address; the manual IP dialog Finish accepts valid IPv4.
Cancel in IP dialog, Quit Party and Quit Game return to the BG2 menu without
logging out of the account.

The V307 account folder router and character-system Python files are
identical to V310. No account character files are moved by this UI patch,
but running account setup starts the installed router and may clean stale
login flags; always close BG2 first and check your profile paths.

Windows gameplay behavior remains to be tested.
