[Blocker] Fix: Remove dead updatePaketStock, fix applyServerPaketStock skip availableStock

# Merapikan Otak Inventori: Ketika Angka Stok Perlu Konsisten Aku baru saja menyelesaikan project mer --- ### Raw Commit Data ## GitHub Update **Repository:** [MKWcorp/POS-DRW-Skincare](https://github.com/MKWcorp/POS-DRW-Skincare) **Author:** multimediadrw **Date:** 5/8/2026, 9:02:37 PM **Commit:** [`1fe8832`](https://github.com/MKWcorp/POS-DRW-Skincare/commit/1fe8832429b20d294c9ce9c9e8956f618b52ace6) ### Commit Message Fix: Remove dead updatePaketStock, fix applyServerPaketStock skip availableStock - Remove @Deprecated updatePaketStock (was dead code, no callers) - applyServerPaketStock: only update sync metadata, NOT paketStock/availableStock - Paket stock = computed from components, never stored/synced from server --- _This story was imported from historical commits._