feat(entry): implement EntryController, EntryService, and EntryResource for managing entries

app/Domains/FiestaFutbolInfantil/Resources/EntryResource.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Domains\FiestaFutbolInfantil\Resources;
+
+use App\Domains\Catalog\Models\CatalogItem;
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/** @mixin CatalogItem */
+class EntryResource extends JsonResource
+{
+    /** @return array<string, mixed> */
+    public function toArray(Request $request): array
+    {
+        $variant = $this->variants->sole();
+
+        return [
+            'id' => $this->id,
+            'title' => $this->nombre,
+            'description' => $this->descripcion,
+            'event_date_ids' => $variant->selectedEventDates()->pluck('id')->values(),
+            'stock' => $variant->inventory->real_stock,
+            'price' => $this->precio,
+        ];
+    }
+}