fix(JoinFamily): 修复被踢出家庭用户仍可直接加入的问题

检查家庭是否被踢出状态，如果是则显示选择弹窗而非直接加入

@@ -128,8 +128,8 @@
               <view class="flex-1">
                 <view class="font-medium text-gray-900 mb-1">
                   {{ family.name }}
-                  <text v-if="family.is_kicked" class="text-xs text-red-500 ml-2">(被大家长移除后无法再加入)</text>
                 </view>
+                <text v-if="family.is_kicked" class="text-xs text-red-500">被大家长移除后无法再加入</text>
                 <view class="text-sm text-gray-600 line-clamp-2">{{ family.note }}</view>
               </view>
 
@@ -400,22 +400,32 @@ const handleJoinFamily = async () => {
       }
 
       if (families.length === 1) {
-        // 只有一个家庭，直接加入
-        const joinFamily = await joinFamilyAPI({
-          family_id: families[0].id,
-          role: selectedRole.value
-        })
-        if (joinFamily.code) {
-          Taro.showToast({
-            title: '加入成功',
-            icon: 'success'
-          })
-
-          setTimeout(() => {
-            Taro.redirectTo({
-              url: '/pages/Dashboard/index'
-            })
-          }, 1500)
+        // 只有一个家庭，检查是否被踢出
+        const family = families[0];
+
+        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;
+        } else {
+          // 未被踢出，直接加入
+          const joinFamily = await joinFamilyAPI({
+            family_id: family.id,
+            role: selectedRole.value
+          });
+
+          if (joinFamily.code) {
+            Taro.showToast({
+              title: '加入成功',
+              icon: 'success'
+            });
+
+            setTimeout(() => {
+              Taro.redirectTo({
+                url: '/pages/Dashboard/index'
+              });
+            }, 1500);
+          }
         }
       } else {
         // 多个家庭，显示选择弹窗