POINT 3 Realtime Sync Patch V3

Fixes:
- Overlay polling reduced from 5 seconds to 700ms.
- Timer display ticks locally every 250ms, so it looks smooth and does not wait for the database every second.
- API responses are no-cache/no-store to stop browser caching delay.
- Removed ALTER TABLE checks from the live status API. Schema checks now only run in installer/start APIs to avoid DB blocking during live preview.
- Director buttons now have busy-lock protection to reduce double-submit/transaction freeze.
- Status fetch has timeout protection, so one slow DB request will not stack multiple requests.

Install:
1. Extract/overwrite these files in the project root.
2. Run install_innings_timer_stats_patch.php once.
3. Hard refresh overlay/director browser windows: Ctrl+F5.