refactor(catalog): rely on inventory for variant availability

tests/Feature/Catalog/CatalogItemDetailControllerTest.php

@@ -335,15 +335,14 @@ class CatalogItemDetailControllerTest extends TestCase
             "/api/tenants/{$tenant->codigo}/catalog-items/{$item->id}/variant-options",
             [
                 'selected_values' => ['sector' => 'A'],
-                'excluded_variant_ids' => [$second->id],
             ],
         )
             ->assertOk()
             ->assertJsonPath('data.valid', true)
             ->assertJsonPath('data.resolved_variant_id', null)
-            ->assertJsonCount(2, 'data.variants')
+            ->assertJsonCount(3, 'data.variants')
             ->assertJsonCount(1, 'data.options.sector')
-            ->assertJsonCount(1, 'data.options.seat')
+            ->assertJsonCount(2, 'data.options.seat')
             ->assertJsonPath('data.options.seat.0.value', '1');
 
         $this->postJson(