fix inventory

app/Http/Resources/Inventory/InventoryItemResource.php

@@ -28,6 +28,16 @@ class InventoryItemResource extends JsonResource
             'semester' => $this['semester'] ?? null,
             'school_year' => $this['school_year'] ?? null,
             'updated_by' => $this['updated_by'] ?? null,
+            // New fields
+            'preferred_supplier_id' => $this['preferred_supplier_id'] ?? null,
+            'last_purchase_price' => $this['last_purchase_price'] ?? null,
+            'average_unit_cost' => $this['average_unit_cost'] ?? null,
+            'reorder_point' => $this['reorder_point'] ?? null,
+            'reorder_quantity' => $this['reorder_quantity'] ?? null,
+            'lead_time_days' => $this['lead_time_days'] ?? null,
+            'barcode' => $this['barcode'] ?? null,
+            'qr_code' => $this['qr_code'] ?? null,
+            'asset_tag' => $this['asset_tag'] ?? null,
         ];
     }
 }