feat(JoinFamily): 添加家庭列表分页加载功能并优化布局

重构家庭选择弹窗布局，使用flexbox替代固定高度计算
添加分页加载功能，包括加载更多按钮和没有更多数据提示
移除不再需要的高度计算逻辑，简化代码结构

@@ -80,14 +80,14 @@
       closeable
       @close="closeFamilySelector"
     >
-      <view class="family-selector-container">
+      <view class="family-selector-container h-full flex flex-col">
         <!-- 标题 -->
-        <view class="text-lg font-bold text-center py-4 border-b border-gray-100">
+        <view class="text-lg font-bold text-center py-4 border-b border-gray-100 flex-shrink-0">
           选择要加入的家庭
         </view>
 
         <!-- 搜索框 -->
-        <view class="p-4">
+        <view class="p-4 flex-shrink-0">
           <nut-searchbar
             v-model="searchKeyword"
             placeholder="搜索家庭名称"
@@ -97,11 +97,10 @@
         </view>
 
         <!-- 家庭列表 -->
-        <view class="flex-1 px-4 pb-4">
+        <view class="flex-1 px-4 pb-4 overflow-hidden">
           <view
             ref="familyListContainer"
-            class="space-y-3 overflow-y-auto"
-            :style="{ maxHeight: familyListHeight + 'rpx' }"
+            class="h-full space-y-3 overflow-y-auto"
           >
             <view
               v-for="family in filteredFamilies"
@@ -138,11 +137,29 @@
                 <Check size="20" />
               </view>
             </view>
+
+            <!-- 加载更多按钮 -->
+            <view v-if="hasMoreData && !searchKeyword" class="text-center py-4">
+              <nut-button
+                @click="loadMoreFamilies"
+                :loading="isLoadingMore"
+                type="default"
+                size="small"
+                plain
+              >
+                {{ isLoadingMore ? '加载中...' : '加载更多' }}
+              </nut-button>
+            </view>
+
+            <!-- 没有更多数据提示 -->
+            <view v-if="!hasMoreData && totalFamilies.length > 0 && !searchKeyword" class="text-center py-4 text-gray-500 text-sm">
+              没有更多家庭了
+            </view>
           </view>
         </view>
 
         <!-- 底部按钮 -->
-        <view class="flex gap-3 p-4 border-t border-gray-100">
+        <view class="flex gap-3 p-4 border-t border-gray-100 flex-shrink-0">
           <nut-button
             @click="closeFamilySelector"
             class="flex-1"
@@ -189,7 +206,14 @@ const searchKeyword = ref('');
 const selectedFamilyId = ref('');
 const mockFamilies = ref([]);
 const familyListContainer = ref(null);
-const familyListHeight = ref(400); // 默认高度
+// 移除不再需要的familyListHeight变量，因为现在使用flexbox布局
+
+// 分页相关数据
+const currentPage = ref(0);
+const pageSize = ref(10);
+const hasMoreData = ref(true);
+const isLoadingMore = ref(false);
+const totalFamilies = ref([]);
 
 const handleInputChange = (index, value) => {
   // 允许输入多个字符，但只保留第一个有效字符（汉字、数字、大小写字母），兼容输入法
@@ -297,40 +321,11 @@ const closeFamilySelector = () => {
   searchKeyword.value = ''
 }
 
-/**
- * 计算家庭列表容器的可用高度
- */
-const calculateFamilyListHeight = async () => {
-  try {
-    // 获取系统信息
-    const systemInfo = await Taro.getSystemInfo()
-    const windowHeight = systemInfo.windowHeight
-
-    // 弹窗高度为70vh
-    const popupHeight = windowHeight * 0.8
-
-    // 减去固定元素的高度（估算值，单位px转rpx需要乘以2）
-    const titleHeight = 60 * 2 // 标题区域
-    const searchHeight = 80 * 2 // 搜索区域
-    const buttonHeight = 80 * 2 // 底部按钮区域
-    const padding = 32 * 2 // 内边距
-
-    // 计算可用高度（px转rpx）
-    const availableHeight = (popupHeight - (titleHeight + searchHeight + buttonHeight + padding) / 2)
-
-    // 设置最小高度和最大高度
-    familyListHeight.value = Math.max(200, Math.min(availableHeight * 2, 800))
-  } catch (error) {
-    console.error('计算高度失败:', error)
-    familyListHeight.value = 400 // 使用默认值
-  }
-}
-
-// 监听弹窗显示状态，动态计算高度
+// 监听弹窗显示状态，重置选中状态
 watch(showFamilySelector, async (newVal) => {
   if (newVal) {
     await nextTick()
-    await calculateFamilyListHeight()
+    // 移除高度计算逻辑，现在使用flexbox自动布局
   }
 })
 
@@ -378,18 +373,28 @@ const handleJoinFamily = async () => {
   const motto = mottoChars.value.join('')
 
   try {
-    // 调用API查询家庭
+    // 重置分页数据
+    currentPage.value = 0;
+    hasMoreData.value = true;
+    totalFamilies.value = [];
+
+    // 调用API查询家庭（第一页）
     const { code, data } = await searchFamilyByPassphraseAPI({
       passphrase: motto,
-      page: 0,
-      limit: 9999
+      page: currentPage.value,
+      limit: pageSize.value
     })
 
     let families = [];
 
     if (code) {
       families = data;
-      console.log('查询家庭:', { motto, role: selectedRole.value, families })
+      totalFamilies.value = families;
+
+      // 检查是否还有更多数据
+      hasMoreData.value = families.length === pageSize.value;
+
+      console.log('查询家庭:', { motto, role: selectedRole.value, families, hasMore: hasMoreData.value })
 
       if (families.length === 0) {
         Taro.showToast({
@@ -406,7 +411,7 @@ const handleJoinFamily = async () => {
         if (family.is_kicked) {
           // 被踢出状态，显示选择弹窗让用户知道
           showFamilySelector.value = true;
-          mockFamilies.value = families;
+          mockFamilies.value = totalFamilies.value;
         } else {
           // 未被踢出，直接加入
           const joinFamily = await joinFamilyAPI({
@@ -430,7 +435,7 @@ const handleJoinFamily = async () => {
       } else {
         // 多个家庭，显示选择弹窗
         showFamilySelector.value = true
-        mockFamilies.value = families
+        mockFamilies.value = totalFamilies.value
       }
     }
   } catch (error) {
@@ -441,6 +446,57 @@ const handleJoinFamily = async () => {
     })
   }
 };
+
+// 加载更多家庭数据
+const loadMoreFamilies = async () => {
+  if (isLoadingMore.value || !hasMoreData.value) return;
+
+  isLoadingMore.value = true;
+
+  try {
+    const motto = mottoChars.value.join('');
+    currentPage.value += 1;
+
+    const { code, data } = await searchFamilyByPassphraseAPI({
+      passphrase: motto,
+      page: currentPage.value,
+      limit: pageSize.value
+    });
+
+    if (code && data) {
+      // 合并新数据到现有数据
+      totalFamilies.value = [...totalFamilies.value, ...data];
+
+      // 检查是否还有更多数据
+      hasMoreData.value = data.length === pageSize.value;
+
+      // 更新mockFamilies用于显示
+      mockFamilies.value = totalFamilies.value;
+
+      console.log('加载更多家庭:', {
+        page: currentPage.value,
+        newCount: data.length,
+        totalCount: totalFamilies.value.length,
+        hasMore: hasMoreData.value
+      });
+    } else {
+      hasMoreData.value = false;
+      Taro.showToast({
+        title: '加载失败',
+        icon: 'none'
+      });
+    }
+  } catch (error) {
+    console.error('加载更多家庭失败:', error);
+    currentPage.value -= 1; // 回退页码
+    Taro.showToast({
+      title: '加载失败，请重试',
+      icon: 'none'
+    });
+  } finally {
+    isLoadingMore.value = false;
+  }
+};
 </script>
 <style lang="less">
 @import './index.less';