API 404 Fix

Problem:
The browser console showed 404 for:
- api/live_score.php
- api/overlay_data.php
- api/score.php

Reason:
The overlay JS was checking fallback API endpoints that did not exist in the project.

Fixed:
- Added compatibility endpoints:
  api/live_score.php
  api/overlay_data.php
  api/score.php

- Updated JS to check existing project APIs first:
  api/overlay_control.php
  api/overlay_events.php
  api/overlay_identity.php

- Updated fetch logic so missing fallback endpoints do not spam console errors.

If your real score data is stored in a different API/file, map that data inside the compatibility PHP files.