'PS' was baked in — wrong for multi-tenant. Now:
1. Honor $tenant->settings['protocol_prefix'] if set
2. Else use uppercase first 2 chars of tenant slug
('psauto' → 'PS', 'autoplus' → 'AP', 'plusrepair' → 'PL')
3. Fallback 'PR' if no tenant resolvable
Format changed from 'PS-{companyId}-{year}-{seq}' to '{PREFIX}-{year}-{seq}'
— dropped the redundant companyId since prefix already identifies the
tenant contextually.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Vasyka
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