feat: 新增基础代谢率功能及相关组件

- 在健康数据中引入基础代谢率的读取和展示，支持用户记录健身进度
- 更新统计页面，替换BMI卡片为基础代谢卡片，提升用户体验
- 优化健康数据获取逻辑，确保基础代谢数据的准确性
- 更新权限描述，明确应用对健康数据的访问需求

app/(tabs)/statistics.tsx

@@ -1,5 +1,5 @@
 import { AnimatedNumber } from '@/components/AnimatedNumber';
-import { BMICard } from '@/components/BMICard';
+import { BasalMetabolismCard } from '@/components/BasalMetabolismCard';
 import { FitnessRingsCard } from '@/components/FitnessRingsCard';
 import { MoodCard } from '@/components/MoodCard';
 import { NutritionRadarCard } from '@/components/NutritionRadarCard';
@@ -140,6 +140,8 @@ export default function ExploreScreen() {
   // HealthKit: 每次页面聚焦都拉取今日数据
   const [stepCount, setStepCount] = useState<number | null>(null);
   const [activeCalories, setActiveCalories] = useState<number | null>(null);
+  // 基础代谢率（千卡）
+  const [basalMetabolism, setBasalMetabolism] = useState<number | null>(null);
   // 睡眠时长（分钟）
   const [sleepDuration, setSleepDuration] = useState<number | null>(null);
   // HRV数据
@@ -235,6 +237,7 @@ export default function ExploreScreen() {
       if (latestRequestKeyRef.current === requestKey) {
         setStepCount(data.steps);
         setActiveCalories(Math.round(data.activeEnergyBurned));
+        setBasalMetabolism(Math.round(data.basalEnergyBurned));
         setSleepDuration(data.sleepDuration);
         // 更新健身圆环数据
         setFitnessRingsData({
@@ -455,14 +458,6 @@ export default function ExploreScreen() {
             {/* 右列 */}
             <View style={styles.masonryColumn}>
               <FloatingCard style={styles.masonryCard} delay={250}>
-                <BMICard
-                  weight={userProfile?.weight ? parseFloat(userProfile.weight) : undefined}
-                  height={userProfile?.height ? parseFloat(userProfile.height) : undefined}
-                  style={styles.bmiCardOverride}
-                />
-              </FloatingCard>
-
-              <FloatingCard style={styles.masonryCard} delay={750}>
                 <FitnessRingsCard
                   activeCalories={fitnessRingsData.activeCalories}
                   activeCaloriesGoal={fitnessRingsData.activeCaloriesGoal}
@@ -474,7 +469,7 @@ export default function ExploreScreen() {
                 />
               </FloatingCard>
 
-              <FloatingCard style={[styles.masonryCard, styles.sleepCard]} delay={1250}>
+              <FloatingCard style={[styles.masonryCard, styles.sleepCard]} delay={750}>
                 <View style={styles.cardHeaderRow}>
                   <Text style={styles.cardTitle}>睡眠</Text>
                 </View>
@@ -487,6 +482,14 @@ export default function ExploreScreen() {
                 )}
               </FloatingCard>
 
+              {/* 基础代谢卡片 */}
+              <FloatingCard style={styles.masonryCard} delay={1250}>
+                <BasalMetabolismCard
+                  value={basalMetabolism}
+                  resetToken={animToken}
+                  style={styles.basalMetabolismCardOverride}
+                />
+              </FloatingCard>
 
             </View>
           </View>
@@ -823,7 +826,7 @@ const styles = StyleSheet.create({
     shadowRadius: 12,
     elevation: 6,
   },
-  bmiCardOverride: {
+  basalMetabolismCardOverride: {
     margin: -16, // 抵消 masonryCard 的 padding
     borderRadius: 16,
   },