feat(inventory): add refunded_units to inventory model and update related services

app/Domains/Catalog/Models/Inventory.php

@@ -10,6 +10,7 @@ use Illuminate\Database\Eloquent\Relations\HasOne;
 
 #[Fillable([
     'sold_units',
+    'refunded_units',
     'reserved_stock',
     'real_stock',
 ])]
@@ -23,6 +24,7 @@ class Inventory extends Model
 
     protected $attributes = [
         'sold_units' => 0,
+        'refunded_units' => 0,
         'reserved_stock' => 0,
         'real_stock' => 0,
     ];
@@ -31,6 +33,7 @@ class Inventory extends Model
     {
         return [
             'sold_units' => 'integer',
+            'refunded_units' => 'integer',
             'reserved_stock' => 'integer',
             'real_stock' => 'integer',
         ];