WinRacing Runtime Foundation V50.3a Hotfix
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1. Removed date_default_timezone_get() from timezone validation paths.
2. Prevented php.ini invalid timezone warnings from leaking into HTML/API output.
3. Added safe validation through ini_get('date.timezone') + DateTimeZone.
4. Added automatic correction from Asia/HongKong to Asia/Hong_Kong.
5. Enforced WinRacing production timezone Asia/Hong_Kong.
6. Enhanced diagnostic display with configured validity and correction status.
7. Runtime version updated from 50.3.0 to 50.3.1.
8. No V44-V50 scoring, betting, SQL decision, UI, or database schema logic changed.