feat: Add event association to purchases; implement event relationship in models, update migration, and enhance tests

app/Domains/Purchase/Services/CheckoutService.php

@@ -26,6 +26,11 @@ class CheckoutService
     public function startCheckout(Tenant $tenant, int $userId, array $purchaseData): Purchase
     {
         return DB::transaction(function () use ($tenant, $userId, $purchaseData): Purchase {
+            /** @var Tenant $tenant */
+            $tenant = Tenant::query()
+                ->lockForUpdate()
+                ->findOrFail($tenant->getKey());
+
             $directItem = $purchaseData['direct_item'] ?? null;
             $cartId = isset($purchaseData['cart_id']) ? (int) $purchaseData['cart_id'] : null;
             unset($purchaseData['direct_item'], $purchaseData['cart_id']);
@@ -615,6 +620,7 @@ class CheckoutService
             ...$purchaseData,
             'cart_id' => $cartId,
             'tenant_codigo' => $tenant->codigo,
+            'event_id' => $tenant->active_event_id,
             'user_id' => $userId,
             'status' => Purchase::STATUS_CREATED,
             'payment_method' => null,