♻️ refactor(passengers): 优化添加乘车人页面配置和样式

- 移除add-passenger.config.ts中冗余的背景色和导航样式配置
- 为ScrollView添加box-border类确保内边距不影响布局计算

mini/src/pages/passengers/add-passenger.config.ts

@@ -1,6 +1,4 @@
 export default definePageConfig({
   navigationBarTitleText: '添加乘车人',
   enablePullDownRefresh: false,
-  backgroundColor: '#f8f9fa',
-  navigationStyle: 'default'
 })

mini/src/pages/passengers/add-passenger.tsx

@@ -143,7 +143,7 @@ const AddPassengerPage: React.FC = () => {
         onClickLeft={() => Taro.navigateBack()}
       />
 
-      <ScrollView className="flex-1 px-4 py-4">
+      <ScrollView className="flex-1 px-4 py-4 box-border">
         <Card className="bg-white rounded-2xl shadow-sm">
           <CardHeader>
             <CardTitle className="text-lg">乘车人信息</CardTitle>