[PROMOTE] Dev to Demo: Updated low stock warning logic to 20% threshold

1. fix: update low stock warning threshold to 20% of max_stock
2. merge: integrate inventory threshold 20% fix

app/Http/Controllers/Admin/RemoteController.php

@@ -207,7 +207,8 @@ class RemoteController extends Controller
         $machineQuery = Machine::withCount([
             'slots as slots_count',
             'slots as low_stock_count' => function ($query) {
-                $query->where('stock', '<=', 5);
+                $query->where('max_stock', '>', 0)
+                    ->whereRaw('stock <= (max_stock * 0.2)');
             },
             'slots as expiring_soon_count' => function ($query) {
                 $query->whereNotNull('expiry_date')