GAZI128 technical game fix

Upload all files into games/ and overwrite aviator.php, crash.php, jetx.php.
Also upload _multiplier_lib.php and multiplier_api.php into games/.

Fixes:
- Uses only ../config/database.php; no fake root/localhost credentials.
- Aviator no longer crashes because its helper is missing.
- Crash and JetX now have the multiplier_api.php endpoint their JavaScript calls.
- The endpoint validates login and game status and stores a server-side round multiplier.
- Multiplier generation uses cryptographically secure randomness and operational min/max only; it does not secretly bias outcomes from winning_chance.
- No SQL import or new database table is required.

After upload test:
/games/aviator.php
/games/crash.php
/games/jetx.php
