feat(purchase): implement purchase limit enforcement and custom exception handling

app/Domains/Purchase/Exceptions/PurchaseLimitExceededException.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Domains\Purchase\Exceptions;
+
+use App\Domains\Catalog\Models\CatalogItem;
+use Illuminate\Validation\ValidationException;
+
+class PurchaseLimitExceededException extends ValidationException
+{
+    public readonly int $catalogItemId;
+
+    public readonly string $catalogItemName;
+
+    public readonly int $maximumAddableQuantity;
+
+    public function __construct(CatalogItem $catalogItem, int $maximumAddableQuantity, string $field)
+    {
+        $this->catalogItemId = (int) $catalogItem->getKey();
+        $this->catalogItemName = $catalogItem->nombre;
+        $this->maximumAddableQuantity = $maximumAddableQuantity;
+
+        parent::__construct(validator([], []));
+
+        $message = trans_choice('api.purchase_limit.exceeded', $maximumAddableQuantity, [
+            'max' => $maximumAddableQuantity,
+            'product' => $this->catalogItemName,
+        ]);
+        $this->message = $message;
+        $this->validator->errors()->add($field, $message);
+    }
+}