Prestige Barber Club v4.39.1 Hotfix Build Test
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PHP files linted: 181
Result: PASS - no PHP syntax errors.

Fixed:
- Backward compatibility function ensure_v4360_schema() added.
- member_approvals.php synchronized to current ensure_v4370_schema() flow.
- upgrade_v4_39_1.php added.
- No destructive database operation.