V163 - NATIVE ACCEPT FIRST + ASYNC ACCOUNT ID AUTOSAVE

1. Character creation ACCEPT no longer waits for the account-folder router.
2. ACCEPT immediately runs BG2 native createCharScreen:AcceptCharacter(-1).
3. Stable account id allocation (dra_1, dra_2, kro_1, ...) is queued in parallel and completed afterward from the multiplayer/gameplay pulse.
4. Name/Done stays native and selectable for imported and new characters.
5. Import Character stays native and account-folder-bound.
6. Import Saved Game/pregenerate remain disabled.
7. Manual Export Character remains disabled.
8. Periodic account autosave overwrites the same stable account id.
9. No automatic character backup/history copies are created.
10. Deleting an already-saved stable character still stops autosave instead of respawning it.
