feat: 新增语音唤醒

唤醒的逻辑跟长按的逻辑不一样，不能像之前那样长按图标来录音，结束长按来结束录音

example/lib/pages/home.dart

@@ -0,0 +1,62 @@
+import 'package:flutter/material.dart';
+import 'package:ai_chat_assistant/ai_chat_assistant.dart';
+
+import 'setting.dart';
+
+class ChatAssistantPage extends StatelessWidget {
+  const ChatAssistantPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: ChatAssistantApp(),
+    );
+  }
+}
+
+class HomePage extends StatefulWidget {
+  HomePage({super.key});
+
+  final items = [
+    BottomNavigationBarItem(
+      icon: Icon(Icons.home),
+      label: 'Home',
+    ),
+    BottomNavigationBarItem(
+      icon: Icon(Icons.settings),
+      label: 'Settings',
+    ),
+  ];
+
+  @override
+  State<HomePage> createState() => _HomePageState();
+}
+
+class _HomePageState extends State<HomePage> {
+  int _selectedIndex = 0;
+
+  final List<Widget> _pages = <Widget>[
+    ChatAssistantPage(),
+    SettingPage(),
+  ];
+
+  void _onItemTapped(int index) {
+    setState(() {
+      _selectedIndex = index;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: _pages.elementAt(_selectedIndex),
+      bottomNavigationBar: BottomNavigationBar(
+        items: widget.items,
+        selectedItemColor: Colors.blue,
+        unselectedItemColor: Colors.grey,
+        currentIndex: _selectedIndex,
+        onTap: _onItemTapped,
+      ),
+    );
+  }
+}