fix(tab): 恢复底部菜单5项(活动/测评/首页/资讯/我的)，首页首屏按钮收敛为预约/测评/入驻

- 底部自定义 tabBar 恢复原 5 项，首页居中，重设默认选中=首页
- app.config.js tabBar.list 同步恢复 5 项
- 首页 Hero CTA 收敛为三枚按钮：预约公益课/沙龙、先做OPC测评、入驻申请
- 入驻申请改为 navigateTo（不再作 tab），park-apply 移除 useTabIndex

miniprogram/src/app.config.js

@@ -30,9 +30,11 @@ export default {
     backgroundColor: '#ffffff',
     borderStyle: 'white',
     list: [
-      { pagePath: 'pages/booking/index', text: '预约' },
+      { pagePath: 'pages/booking/index', text: '活动' },
       { pagePath: 'pages/test/index', text: '测评' },
-      { pagePath: 'pages/park-apply/index', text: '入驻' }
+      { pagePath: 'pages/index/index', text: '首页' },
+      { pagePath: 'pages/content/index', text: '资讯' },
+      { pagePath: 'pages/mine/index', text: '我的' }
     ]
   }
 };

miniprogram/src/custom-tab-bar/index.jsx

@@ -3,16 +3,18 @@ import { View, Text } from '@tarojs/components';
 import Taro from '@tarojs/taro';
 import './index.scss';
 
-/* 与 app.config.js tabBar.list 保持一致；仅 3 项：预约 / 测评 / 入驻 */
+/* 与 app.config.js tabBar.list 保持一致；首页(index)居中并做特殊凸起按钮 */
 const LIST = [
-  { pagePath: '/pages/booking/index', text: '预约', icon: 'book' },
+  { pagePath: '/pages/booking/index', text: '活动', icon: 'book' },
   { pagePath: '/pages/test/index', text: '测评', icon: 'compass' },
-  { pagePath: '/pages/park-apply/index', text: '入驻', icon: 'shield' }
+  { pagePath: '/pages/index/index', text: '首页', icon: 'star', center: true },
+  { pagePath: '/pages/content/index', text: '资讯', icon: 'shield' },
+  { pagePath: '/pages/mine/index', text: '我的', icon: 'user' }
 ];
 
 export default class CustomTabBar extends Component {
   state = {
-    selected: 0 // 默认预约
+    selected: 2 // 默认首页（居中）
   };
 
   switchTab = (item, index) => {

miniprogram/src/pages/index/index.jsx

@@ -23,11 +23,9 @@ export default function Index() {
         </View>
         <Text className="mk-subhead">{MK_HERO.subhead}</Text>
         <View className="mk-cta">
-          <Button className="btn btn-cta" onClick={goTab(MK_HERO.ctaPrimary.tab)}>{MK_HERO.ctaPrimary.label} →</Button>
+          <Button className="btn btn-cta" onClick={goTab(MK_HERO.ctaPrimary.tab)}>{MK_HERO.ctaPrimary.label}</Button>
           <Button className="btn btn-ghost" onClick={goTab(MK_HERO.ctaSecondary.tab)}>{MK_HERO.ctaSecondary.label}</Button>
-          <Button className="btn btn-ghost" onClick={() => Taro.switchTab({ url: '/pages/park-apply/index' })}>申请入驻</Button>
-          <Button className="btn btn-ghost" onClick={() => Taro.navigateTo({ url: '/pages/cert-apply/index' })}>OPC认证</Button>
-          <Button className="btn btn-ghost" onClick={() => Taro.navigateTo({ url: '/pages/park-transfer/index' })}>转园申请</Button>
+          <Button className="btn btn-ghost" onClick={() => Taro.navigateTo({ url: '/pages/park-apply/index' })}>入驻申请</Button>
         </View>
       </View>
 

miniprogram/src/pages/park-apply/index.jsx

@@ -1,6 +1,5 @@
 import { View, Text, Input, Textarea, Button, Radio, RadioGroup, Checkbox, CheckboxGroup, Picker } from '@tarojs/components';
 import Taro from '@tarojs/taro';
-import { useTabIndex } from '@/utils/tab';
 import { useState, useEffect } from 'react';
 import { phoneLogin, bindPhone, isAuthed, getUser } from '@/utils/auth';
 import {
@@ -20,7 +19,6 @@ const EMPTY = () => ({
 });
 
 export default function ParkApply() {
-  useTabIndex(2);
   const [authed, setAuthed] = useState(isAuthed());
   const [gatePhone, setGatePhone] = useState('');
   const [gateCode, setGateCode] = useState('');