fix(limit-purchase): 防止更新商品时规则为空导致错误

- 在更新商品限购规则前增加判断，避免因规则数据缺失引发异常
- 提升系统稳定性，确保仅在规则存在时执行更新操作

src/Hook/GoodsHook.php

@@ -35,6 +35,8 @@ class GoodsHook
     #[Hook(GoodsUpdatedEvent::class)]
     public function goodsUpdated(GoodsUpdatedEvent $event): void
     {
-        $this->goodsLimitPurchaseRuleEntity->updateRule($event->data['id'], $event->data['goods']['limit_purchase_rule']);
+        if (isset($event->data['goods']['limit_purchase_rule'])) {
+            $this->goodsLimitPurchaseRuleEntity->updateRule($event->data['id'], $event->data['goods']['limit_purchase_rule']);
+        }
     }
 }