[Blocker] Fix: Use computed paket stock instead of stale stored availableStock

# Menguak Misteri Stok Paket: Dari Kadaluarsa ke Real-time! 🕵️‍♀️ --- ### Raw Commit Data ## GitHub Update **Repository:** [MKWcorp/POS-DRW-Skincare](https://github.com/MKWcorp/POS-DRW-Skincare) **Author:** multimediadrw **Date:** 5/8/2026, 8:59:48 PM **Commit:** [`cf19803`](https://github.com/MKWcorp/POS-DRW-Skincare/commit/cf19803de118a319c9b6eec21f154042c36b9da7) ### Commit Message Fix: Use computed paket stock instead of stale stored availableStock - availablePaketList: watch productStockMapProvider + computeAvailableStock() - paket_repository.getAvailablePakets(): remove availableStockGreaterThan(0) filter - Paket stock = computed from component products, not static DB value - Consistent with backend filter + DB cleanup (3405 paket entries removed) --- _This story was imported from historical commits._