Saufi 12324091dd feat: qr code generation ...

- QrCodeService: generate unique 48-char token, create QR PNG (400x400, error-correction H)
- QrCodeController: show, generate, download PNG, deactivate
- Admin QR page: preview, copy URL, download, regenerate, deactivate
- Existing active QR deactivated on regenerate
- Token-based URL (not program ID) for PDPA compliance

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-16 19:42:33 +08:00

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