Prestige Barber Club v4.43.9 — Membership Quick POS + QRIS

Implemented:
- New membership_quick_sale.php for simplified one-screen membership sale.
- Member search/select, package, cashier, discount, Cash/QRIS/Transfer/E-Wallet/Debit.
- QRIS Branding image shown prominently with live total.
- Cash received/change calculation.
- Existing payment proof rules retained for applicable methods.
- Successful sale shows Member QR and shortcuts to card/history/new sale.
- Main Jual Membership menu points to Quick POS; legacy membership_sales.php remains available.
- members.php Jual Membership shortcut points to Quick POS with preselected member.
- v4.43.9 idempotent schema marker; no destructive schema migration.

Validation:
- Full PHP lint: 247 PHP files, 0 syntax errors.
- No live MySQL/browser/payment-device test performed in this build environment.