feat: add is_vatable column to supplier_quote_items

app/Models/SupplierQuoteItem.php

@@ -7,7 +7,11 @@ use Illuminate\Database\Eloquent\Model;
 class SupplierQuoteItem extends Model
 {
     protected $fillable = [
-        'supplier_quote_id', 'description', 'unit', 'quantity', 'unit_price', 'total_price',
+        'supplier_quote_id', 'description', 'unit', 'quantity', 'unit_price', 'total_price', 'is_vatable',
+    ];
+
+    protected $casts = [
+        'is_vatable' => 'boolean',
     ];
 
     public function quote()