Fix: Remove fixed width to prevent horizontal scrolling on iOS

pages/evaluate2/product-list.wxml

@@ -1,7 +1,7 @@
 <view class="container">
   <!-- 头部导航栏 -->
   <view class="header">
-    <view class="header-content" style="width: 800rpx; display: flex; align-items: center; justify-content: space-between; box-sizing: border-box; padding: 0 20rpx;">
+    <view class="header-content" style="display: flex; align-items: center; justify-content: space-between; box-sizing: border-box; padding: 0 20rpx;">
       <button class="title" bindtap="goBackToCategories">返回分类</button>
       <text class="title">商品选择</text>
       <view style="width: 120rpx;"></view> <!-- 占位，保持标题居中 -->