feat(fasting): add auto-renewal and reset functionality for fasting plans

- Implement auto-renewal logic for completed fasting cycles using dayjs
- Add reset button with information modal in FastingOverviewCard
- Configure iOS push notifications for production environment
- Add expo-media-library and react-native-view-shot dependencies
- Update FastingScheduleOrigin type to include 'auto' origin

app/(tabs)/fasting.tsx

@@ -24,6 +24,7 @@ import {
 } from '@/utils/fasting';
 import { useFocusEffect } from '@react-navigation/native';
 import { useRouter } from 'expo-router';
+import dayjs from 'dayjs';
 import React, { useCallback, useEffect, useMemo, useState } from 'react';
 import { ScrollView, StyleSheet, Text, View } from 'react-native';
 import { useSafeAreaInsets } from 'react-native-safe-area-context';
@@ -154,6 +155,53 @@ export default function FastingTabScreen() {
     }
   }, [notificationsReady, notificationsLoading, notificationError, notificationIds, lastSyncTime, activeSchedule?.startISO, currentPlan?.id]);
 
+  useEffect(() => {
+    if (!activeSchedule || !currentPlan) return;
+    if (phase !== 'completed') return;
+
+    const start = dayjs(activeSchedule.startISO);
+    const end = dayjs(activeSchedule.endISO);
+    if (!start.isValid() || !end.isValid()) return;
+
+    const now = dayjs();
+    if (now.isBefore(end)) return;
+
+    const fastingHours = currentPlan.fastingHours;
+    const eatingHours = currentPlan.eatingHours;
+    const cycleHours = fastingHours + eatingHours;
+
+    if (fastingHours <= 0 || cycleHours <= 0) return;
+
+    let nextStart = start;
+    let nextEnd = end;
+    let iterations = 0;
+    const maxIterations = 60;
+
+    while (!now.isBefore(nextEnd)) {
+      nextStart = nextStart.add(cycleHours, 'hour');
+      nextEnd = nextStart.add(fastingHours, 'hour');
+      iterations += 1;
+
+      if (iterations >= maxIterations) {
+        if (__DEV__) {
+          console.warn('自动续订断食周期失败: 超出最大迭代次数', {
+            start: activeSchedule.startISO,
+            end: activeSchedule.endISO,
+            planId: currentPlan.id,
+          });
+        }
+        return;
+      }
+    }
+
+    if (iterations === 0) return;
+
+    dispatch(rescheduleActivePlan({
+      start: nextStart.toDate().toISOString(),
+      origin: 'auto',
+    }));
+  }, [dispatch, activeSchedule, currentPlan, phase]);
+
   const handleAdjustStart = () => {
     if (!currentPlan) return;
     setShowPicker(true);
@@ -213,6 +261,7 @@ export default function FastingTabScreen() {
             endTimeLabel={displayWindow.endTimeLabel}
             onAdjustStartPress={handleAdjustStart}
             onViewMealsPress={handleViewMeal}
+            onResetPress={handleResetPlan}
             progress={progress}
           />
         )}
@@ -233,9 +282,6 @@ export default function FastingTabScreen() {
               <Text style={styles.resetHint}>
                 如果计划与作息不符，可重新选择方案或调整开始时间。
               </Text>
-              <Text style={styles.resetAction} onPress={handleResetPlan}>
-                重置
-              </Text>
             </View>
           </View>
         )}
@@ -325,20 +371,10 @@ const styles = StyleSheet.create({
     lineHeight: 20,
   },
   resetRow: {
-    flexDirection: 'row',
-    justifyContent: 'space-between',
-    alignItems: 'center',
     marginTop: 16,
   },
   resetHint: {
-    flex: 1,
     fontSize: 12,
     color: '#8A96A3',
-    marginRight: 12,
-  },
-  resetAction: {
-    fontSize: 12,
-    fontWeight: '600',
-    color: '#6366F1',
   },
 });