feat(search): implement catalog item search functionality with request validation and resource formatting

app/Domains/Catalog/Resources/CatalogSearchItemResource.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Domains\Catalog\Resources;
+
+use App\Domains\Catalog\Enums\InventoryPolicy;
+use App\Domains\Catalog\Models\CatalogItem;
+use App\Domains\Catalog\Models\Variant;
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/** @mixin CatalogItem */
+class CatalogSearchItemResource extends JsonResource
+{
+    /** @return array<string, mixed> */
+    public function toArray(Request $request): array
+    {
+        $attachment = $this->attachments->first()
+            ?? $this->variants
+                ->flatMap(fn (Variant $variant) => $variant->attachments)
+                ->first();
+
+        return [
+            'id' => $this->id,
+            'type' => $this->type->value,
+            'nombre' => $this->nombre,
+            'descripcion' => $this->descripcion,
+            'precio' => $this->precio,
+            'image' => $attachment?->getTemporaryUrl(1440),
+            'stock_tecnico' => $this->availableStock(),
+            'variants' => $this->variants
+                ->map(fn (Variant $variant): array => [
+                    'id' => $variant->id,
+                    'stock_tecnico' => $this->inventory_policy === InventoryPolicy::Unlimited
+                        ? null
+                        : $variant->inventory?->availableStock(),
+                    'values' => $variant->definitions
+                        ->mapWithKeys(fn ($definition) => [
+                            $definition->itemAttribute?->attribute?->codigo => $definition->value,
+                        ])
+                        ->filter(fn ($value, $key): bool => $key !== null),
+                ])
+                ->values(),
+        ];
+    }
+}