feat(积分页面): 添加家庭积分显示及大家长兑换提示

在积分页面添加家庭积分显示，并当用户是家庭创建者时显示兑换提示

 <!--
  * @Date: 2025-08-27 17:47:26
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-09-17 17:16:33
+ * @LastEditTime: 2025-09-19 15:44:38
  * @FilePath: /lls_program/src/pages/Rewards/index.vue
  * @Description: 文件描述
 -->
@@ -13,8 +13,9 @@
     <view class="relative z-10 flex-1 pb-20">
       <!-- Points display -->
       <view class="pt-8 pb-8 flex flex-col items-center">
-        <h2 class="text-4xl font-bold text-white mb-1">{{ totalPoints }}分</h2>
-        <p class="text-white text-opacity-80">我的积分</p>
+        <view class="text-4xl font-bold text-white mb-1">{{ totalPoints }}分</view>
+        <view class="text-white text-opacity-80">家庭积分</view>
+        <view v-if="isFamilyCreator" class="text-white text-xs mt-1">请您的大家长进行兑换</view>
       </view>
       <!-- Main content -->
       <view class="bg-white rounded-t-3xl px-4 pt-5">
@@ -124,6 +125,7 @@ const selectedPoints = ref(null);
 const sortOrder = ref('desc'); // 'asc' or 'desc'
 
 const totalPoints = ref(0);
+const isFamilyCreator = ref(false);
 
 // 页面参数
 const pageParams = ref({
@@ -236,6 +238,7 @@ const fetchCouponList = async (reset = false) => {
       if (reset) {
         couponList.value = coupons;
         totalPoints.value = data?.user_points || 0;
+        isFamilyCreator.value = data?.is_family_creator || false;
         currentPage.value = 0;
       } else {
         couponList.value = [...couponList.value, ...coupons];