feat: 新增营养摄入分析卡片并优化相关页面

- 在统计页面中引入营养摄入分析卡片，展示用户的营养数据
- 更新探索页面，增加营养数据加载逻辑，确保用户体验一致性
- 移除不再使用的推荐文章逻辑，简化代码结构
- 更新路由常量，确保路径管理集中化
- 优化体重历史记录卡片，提升用户交互体验

app/(tabs)/explore.tsx

@@ -6,17 +6,16 @@ import { ThemedView } from '@/components/ThemedView';
 import { Colors } from '@/constants/Colors';
 import { useAppDispatch, useAppSelector } from '@/hooks/redux';
 import { useColorScheme } from '@/hooks/useColorScheme';
-import { listRecommendedArticles } from '@/services/articles';
 import { fetchRecommendations, RecommendationType } from '@/services/recommendations';
 import { loadPlans } from '@/store/trainingPlanSlice';
 // Removed WorkoutCard import since we no longer use the horizontal carousel
+import { QUERY_PARAMS, ROUTE_PARAMS, ROUTES } from '@/constants/Routes';
 import { useAuthGuard } from '@/hooks/useAuthGuard';
 import { TrainingPlan } from '@/services/trainingPlanApi';
 import { useRouter } from 'expo-router';
 import React from 'react';
 import { Animated, Image, PanResponder, Pressable, SafeAreaView, ScrollView, StyleSheet, useWindowDimensions, View } from 'react-native';
 import { useSafeAreaInsets } from 'react-native-safe-area-context';
-import { ROUTES, QUERY_PARAMS, ROUTE_PARAMS } from '@/constants/Routes';
 
 // 移除旧的“热门活动”滑动数据，改为固定的“热点功能”卡片
 
@@ -103,42 +102,7 @@ export default function HomeScreen() {
       readCount: number;
     };
 
-  // 打底数据（接口不可用时）
-  const getFallbackItems = React.useCallback((): RecommendItem[] => {
-    return [
-      {
-        type: 'plan',
-        key: 'today-workout',
-        image:
-          'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/imagedemo.jpeg',
-        title: '今日训练',
-        subtitle: '完成一次普拉提训练，记录你的坚持',
-        level: '初学者',
-        onPress: () => pushIfAuthedElseLogin(ROUTES.WORKOUT_TODAY),
-      },
-      {
-        type: 'plan',
-        key: 'assess',
-        image:
-          'https://plates-1251306435.cos.ap-guangzhou.myqcloud.com/images/imagedemo.jpeg',
-        title: '体态评估',
-        subtitle: '评估你的体态，制定训练计划',
-        level: '初学者',
-        onPress: () => router.push(ROUTES.AI_POSTURE_ASSESSMENT),
-      },
-      ...listRecommendedArticles().map((a) => ({
-        type: 'article' as const,
-        key: `article-${a.id}`,
-        id: a.id,
-        title: a.title,
-        coverImage: a.coverImage,
-        publishedAt: a.publishedAt,
-        readCount: a.readCount,
-      })),
-    ];
-  }, [router, pushIfAuthedElseLogin]);
-
-  const [items, setItems] = React.useState<RecommendItem[]>(() => getFallbackItems());
+  const [items, setItems] = React.useState<RecommendItem[]>();
 
   // 加载训练计划数据
   React.useEffect(() => {
@@ -191,15 +155,15 @@ export default function HomeScreen() {
           }
         }
         // 若接口返回空，也回退到打底
-        setItems(mapped.length > 0 ? mapped : getFallbackItems());
+        setItems(mapped.length > 0 ? mapped : []);
       } catch (e) {
         console.error('fetchRecommendations error', e);
-        setItems(getFallbackItems());
+        setItems([]);
       }
     }
     load();
     return () => { canceled = true; };
-  }, [isLoggedIn, pushIfAuthedElseLogin, getFallbackItems]);
+  }, [isLoggedIn, pushIfAuthedElseLogin]);
 
   // 处理点击训练计划卡片，跳转到锻炼tab
   const handlePlanCardPress = () => {
@@ -335,7 +299,7 @@ export default function HomeScreen() {
             <ThemedText style={styles.sectionTitle}>为你推荐</ThemedText>
 
             <View style={styles.planList}>
-              {items.map((item) => {
+              {items?.map((item) => {
                 if (item.type === 'article') {
                   return (
                     <ArticleCard