feat: 集成 Redux 状态管理和用户目标管理功能

- 添加 Redux 状态管理，支持用户登录和个人信息的持久化
- 新增目标管理页面，允许用户设置每日卡路里和步数目标
- 更新首页，移除旧的活动展示，改为固定的热点功能卡片
- 修改布局以适应新功能的展示和交互
- 更新依赖，添加 @reduxjs/toolkit 和 react-redux 库以支持状态管理
- 新增 API 服务模块，处理与后端的交互

app/(tabs)/index.tsx

@@ -2,25 +2,13 @@ import { PlanCard } from '@/components/PlanCard';
 import { SearchBox } from '@/components/SearchBox';
 import { ThemedText } from '@/components/ThemedText';
 import { ThemedView } from '@/components/ThemedView';
-import { WorkoutCard } from '@/components/WorkoutCard';
+// Removed WorkoutCard import since we no longer use the horizontal carousel
 import { getChineseGreeting } from '@/utils/date';
 import { useRouter } from 'expo-router';
 import React, { useEffect, useRef } from 'react';
-import { SafeAreaView, ScrollView, StyleSheet, View } from 'react-native';
+import { Pressable, SafeAreaView, ScrollView, StyleSheet, View } from 'react-native';
 
-const workoutData = [
-  {
-    id: 1,
-    title: 'AI体态评估',
-    duration: 5,
-    imageSource: 'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/Imagettpg.png',
-  },
-  {
-    id: 2,
-    title: '认证教练',
-    imageSource: require('@/assets/images/react-logo.png'),
-  }
-];
+// 移除旧的“热门活动”滑动数据，改为固定的“热点功能”卡片
 
 export default function HomeScreen() {
   const router = useRouter();
@@ -46,34 +34,33 @@ export default function HomeScreen() {
           {/* Search Box */}
           <SearchBox placeholder="搜索" />
 
-          {/* Popular Workouts Section */}
+          {/* Hot Features Section */}
           <View style={styles.sectionContainer}>
-            <ThemedText style={styles.sectionTitle}>热门活动</ThemedText>
+            <ThemedText style={styles.sectionTitle}>热点功能</ThemedText>
 
-            <ScrollView
-              horizontal
-              showsHorizontalScrollIndicator={false}
-              contentContainerStyle={styles.workoutScrollContainer}
-              style={styles.workoutScroll}
-            >
-              {workoutData.map((workout) => (
-                <WorkoutCard
-                  key={workout.id}
-                  title={workout.title}
-                  duration={workout.duration}
-                  imageSource={workout.imageSource}
-                  onPress={() => {
-                    if (workout.title === 'AI体态评估') {
-                      router.push('/ai-posture-assessment');
-                    } else if (workout.title === '认证教练') {
-                      router.push('/health-consultation' as any);
-                    } else {
-                      console.log(`Pressed ${workout.title}`);
-                    }
-                  }}
-                />
-              ))}
-            </ScrollView>
+            <View style={styles.featureGrid}>
+              <Pressable
+                style={[styles.featureCard, styles.featureCardPrimary]}
+                onPress={() => router.push('/ai-posture-assessment')}
+              >
+                <ThemedText style={styles.featureTitle}>AI体态评估</ThemedText>
+                <ThemedText style={styles.featureSubtitle}>3分钟获取体态报告</ThemedText>
+                <View style={styles.featureCta}>
+                  <ThemedText style={styles.featureCtaText}>开始评估</ThemedText>
+                </View>
+              </Pressable>
+
+              <Pressable
+                style={[styles.featureCard, styles.featureCardSecondary]}
+                onPress={() => router.push('/health-consultation' as any)}
+              >
+                <ThemedText style={styles.featureTitle}>在线教练</ThemedText>
+                <ThemedText style={styles.featureSubtitle}>认证教练 · 1对1即时解答</ThemedText>
+                <View style={styles.featureCta}>
+                  <ThemedText style={styles.featureCtaText}>立即咨询</ThemedText>
+                </View>
+              </Pressable>
+            </View>
           </View>
 
           {/* Today Plan Section */}
@@ -144,15 +131,62 @@ const styles = StyleSheet.create({
     paddingHorizontal: 24,
     marginBottom: 18,
   },
+  featureGrid: {
+    paddingHorizontal: 24,
+    flexDirection: 'row',
+    justifyContent: 'space-between',
+  },
+  featureCard: {
+    width: '48%',
+    borderRadius: 16,
+    padding: 16,
+    backgroundColor: '#FFFFFF',
+    // iOS shadow
+    shadowColor: '#000',
+    shadowOpacity: 0.08,
+    shadowRadius: 12,
+    shadowOffset: { width: 0, height: 6 },
+    // Android shadow
+    elevation: 4,
+  },
+  featureCardPrimary: {
+    backgroundColor: '#EEF2FF', // 柔和的靛蓝背景
+  },
+  featureCardSecondary: {
+    backgroundColor: '#F0FDFA', // 柔和的青绿背景
+  },
+  featureIcon: {
+    fontSize: 28,
+    marginBottom: 8,
+  },
+  featureTitle: {
+    fontSize: 18,
+    fontWeight: '700',
+    color: '#0F172A',
+    marginBottom: 6,
+  },
+  featureSubtitle: {
+    fontSize: 12,
+    color: '#6B7280',
+    lineHeight: 16,
+    marginBottom: 12,
+  },
+  featureCta: {
+    alignSelf: 'flex-start',
+    backgroundColor: '#0F172A',
+    paddingHorizontal: 10,
+    paddingVertical: 6,
+    borderRadius: 999,
+  },
+  featureCtaText: {
+    color: '#FFFFFF',
+    fontSize: 12,
+    fontWeight: '600',
+  },
   planList: {
     paddingHorizontal: 24,
   },
-  workoutScroll: {
-    paddingLeft: 24,
-  },
-  workoutScrollContainer: {
-    paddingRight: 24,
-  },
+  // 移除旧的滑动样式
   bottomSpacing: {
     height: 120,
   },