feat(家庭健康): 优化家庭组加入流程，移除自动创建家庭组逻辑

app/health/family-invite.tsx

@@ -1,7 +1,6 @@
 import { HeaderBar } from '@/components/ui/HeaderBar';
 import { useAppDispatch, useAppSelector } from '@/hooks/redux';
 import {
-  createFamilyGroup,
   fetchFamilyGroup,
   generateInviteCode,
   selectFamilyGroup,
@@ -13,16 +12,16 @@ import { Ionicons } from '@expo/vector-icons';
 import { LinearGradient } from 'expo-linear-gradient';
 import { Stack } from 'expo-router';
 import React, { useEffect, useState } from 'react';
-import { 
-  ActivityIndicator, 
-  Alert, 
-  Modal, 
-  ScrollView, 
-  Share, 
-  StyleSheet, 
-  Text, 
-  TouchableOpacity, 
-  View 
+import {
+  ActivityIndicator,
+  Alert,
+  Modal,
+  ScrollView,
+  Share,
+  StyleSheet,
+  Text,
+  TouchableOpacity,
+  View
 } from 'react-native';
 import { useSafeAreaInsets } from 'react-native-safe-area-context';
 
@@ -47,11 +46,6 @@ export default function FamilyInviteScreen() {
   // 处理邀请按钮点击
   const handleInvite = async () => {
     try {
-      // 如果没有家庭组，先创建一个
-      if (!familyGroup) {
-        await dispatch(createFamilyGroup('我的家庭')).unwrap();
-      }
-      
       // 生成邀请码
       await dispatch(generateInviteCode(24)).unwrap();