feat(auth): 添加登录验证到食物记录相关功能

- 在食物拍照、语音记录和营养成分分析功能中添加登录验证
- 使用 ensureLoggedIn 方法确保用户已登录后再调用服务端接口
- 使用 pushIfAuthedElseLogin 方法处理需要登录的页面导航
- 添加新的营养图标资源
- 在路由常量中添加 FOOD_CAMERA 路由定义
- 更新 Memory Bank 任务文档，记录登录验证和路由常量管理的实现模式

components/NutritionRadarCard.tsx

@@ -250,7 +250,7 @@ export function NutritionRadarCard({
           style={styles.foodOptionItem}
           onPress={() => {
             triggerLightHaptic();
-            pushIfAuthedElseLogin(`/food/camera?mealType=${currentMealType}`);
+            router.push(`${ROUTES.FOOD_CAMERA}?mealType=${currentMealType}`);
           }}
           activeOpacity={0.7}
         >
@@ -284,7 +284,7 @@ export function NutritionRadarCard({
           style={styles.foodOptionItem}
           onPress={() => {
             triggerLightHaptic();
-            pushIfAuthedElseLogin(`${ROUTES.VOICE_RECORD}?mealType=${currentMealType}`);
+            router.push(`${ROUTES.VOICE_RECORD}?mealType=${currentMealType}`);
           }}
           activeOpacity={0.7}
         >
@@ -301,13 +301,13 @@ export function NutritionRadarCard({
           style={styles.foodOptionItem}
           onPress={() => {
             triggerLightHaptic();
-            pushIfAuthedElseLogin(`${ROUTES.NUTRITION_LABEL_ANALYSIS}?mealType=${currentMealType}`);
+            router.push(`${ROUTES.NUTRITION_LABEL_ANALYSIS}?mealType=${currentMealType}`);
           }}
           activeOpacity={0.7}
         >
           <View style={[styles.foodOptionIcon]}>
             <Image
-              source={require('@/assets/images/icons/icon-recommend.png')}
+              source={require('@/assets/images/icons/icon-yingyang.png')}
               style={styles.foodOptionImage}
             />
           </View>