feat: 添加AI体态评估页面及相关功能

- 新增AI体态评估页面，包含训练内容和统计信息
- 在首页中添加AI体态评估的导航链接
- 更新package-lock.json，调整依赖项的dev标记
- 修改布局文件以支持新页面的导航

app/(tabs)/index.tsx

@@ -4,6 +4,7 @@ import { ThemedText } from '@/components/ThemedText';
 import { ThemedView } from '@/components/ThemedView';
 import { WorkoutCard } from '@/components/WorkoutCard';
 import { getChineseGreeting } from '@/utils/date';
+import { useRouter } from 'expo-router';
 import React from 'react';
 import { SafeAreaView, ScrollView, StyleSheet, View } from 'react-native';
 
@@ -22,6 +23,7 @@ const workoutData = [
 ];
 
 export default function HomeScreen() {
+  const router = useRouter();
   return (
     <SafeAreaView style={styles.safeArea}>
       <ThemedView style={styles.container}>
@@ -51,7 +53,13 @@ export default function HomeScreen() {
                   title={workout.title}
                   duration={workout.duration}
                   imageSource={workout.imageSource}
-                  onPress={() => console.log(`Pressed ${workout.title}`)}
+                  onPress={() => {
+                    if (workout.title === 'AI体态评估') {
+                      router.push('/ai-posture-assessment');
+                    } else {
+                      console.log(`Pressed ${workout.title}`);
+                    }
+                  }}
                 />
               ))}
             </ScrollView>