feat(inventory): add InventorySubject enum and integrate into catalog item management

app/Domains/Catalog/Resources/CatalogItemResource.php

@@ -23,6 +23,7 @@ class CatalogItemResource extends JsonResource
             'descripcion' => $this->descripcion,
             'precio' => $this->precio,
             'inventory_policy' => $this->inventory_policy?->value,
+            'inventory_subject' => $this->inventory_subject->value,
             'max_units_per_user' => $this->max_units_per_user,
             'has_tickets' => $this->has_tickets,
             'ticket_generation_policy' => $this->ticket_generation_policy->value,