feat(auth): 为未登录用户添加登录引导界面

为目标页面、营养记录、食物添加等功能添加登录状态检查和引导界面，确保用户在未登录状态下能够获得清晰的登录提示和指引。

- 在目标页面添加精美的未登录引导界面，包含渐变背景和登录按钮
- 为食物记录相关组件添加登录状态检查，未登录时自动跳转登录页面
- 重构血氧饱和度卡片为独立数据获取，移除对外部数据依赖
- 移除个人页面的实验性SwiftUI组件，统一使用原生TouchableOpacity
- 清理统计页面和营养记录页面的冗余代码和未使用变量

components/NutritionRadarCard.tsx

@@ -1,8 +1,9 @@
 import { AnimatedNumber } from '@/components/AnimatedNumber';
 import { ROUTES } from '@/constants/Routes';
+import { useAuthGuard } from '@/hooks/useAuthGuard';
 import { NutritionSummary } from '@/services/dietRecords';
 import { triggerLightHaptic } from '@/utils/haptics';
-import { NutritionGoals, calculateRemainingCalories } from '@/utils/nutrition';
+import { calculateRemainingCalories } from '@/utils/nutrition';
 import dayjs from 'dayjs';
 import { router } from 'expo-router';
 import React, { useEffect, useMemo, useRef, useState } from 'react';
@@ -14,8 +15,6 @@ const AnimatedCircle = Animated.createAnimatedComponent(Circle);
 
 export type NutritionRadarCardProps = {
   nutritionSummary: NutritionSummary | null;
-  /** 营养目标 */
-  nutritionGoals?: NutritionGoals;
   /** 基础代谢消耗的卡路里 */
   burnedCalories?: number;
   /** 基础代谢率 */
@@ -25,8 +24,6 @@ export type NutritionRadarCardProps = {
 
   /** 动画重置令牌 */
   resetToken?: number;
-  /** 餐次点击回调 */
-  onMealPress?: (mealType: 'breakfast' | 'lunch' | 'dinner' | 'snack') => void;
 };
 
 // 简化的圆环进度组件
@@ -97,16 +94,15 @@ const SimpleRingProgress = ({
 
 export function NutritionRadarCard({
   nutritionSummary,
-  nutritionGoals,
   burnedCalories = 1618,
   basalMetabolism,
   activeCalories,
-
   resetToken,
-  onMealPress
 }: NutritionRadarCardProps) {
   const [currentMealType] = useState<'breakfast' | 'lunch' | 'dinner' | 'snack'>('breakfast');
 
+  const { pushIfAuthedElseLogin } = useAuthGuard()
+
   const nutritionStats = useMemo(() => {
     return [
       { label: '热量', value: nutritionSummary ? `${Math.round(nutritionSummary.totalCalories)} 千卡` : '0 千卡', color: '#FF6B6B' },
@@ -225,7 +221,7 @@ export function NutritionRadarCard({
           style={styles.foodOptionItem}
           onPress={() => {
             triggerLightHaptic();
-            router.push(`/food/camera?mealType=${currentMealType}`);
+            pushIfAuthedElseLogin(`/food/camera?mealType=${currentMealType}`);
           }}
           activeOpacity={0.7}
         >
@@ -242,7 +238,7 @@ export function NutritionRadarCard({
           style={styles.foodOptionItem}
           onPress={() => {
             triggerLightHaptic();
-            router.push(`${ROUTES.FOOD_LIBRARY}?mealType=${currentMealType}`);
+            pushIfAuthedElseLogin(`${ROUTES.FOOD_LIBRARY}?mealType=${currentMealType}`);
           }}
           activeOpacity={0.7}
         >
@@ -259,7 +255,7 @@ export function NutritionRadarCard({
           style={styles.foodOptionItem}
           onPress={() => {
             triggerLightHaptic();
-            router.push(`${ROUTES.VOICE_RECORD}?mealType=${currentMealType}`);
+            pushIfAuthedElseLogin(`${ROUTES.VOICE_RECORD}?mealType=${currentMealType}`);
           }}
           activeOpacity={0.7}
         >