feat: enforce iOS AI safety policy and citations

health_app/lib/pages/settings/settings_pages.dart

@@ -1,3 +1,5 @@
+import 'dart:io';
+
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:shadcn_ui/shadcn_ui.dart';
@@ -49,11 +51,12 @@ class SettingsPage extends ConsumerWidget {
                       title: '长辈模式',
                       onTap: () => pushRoute(ref, 'elderMode'),
                     ),
-                    _SettingsTile(
-                      icon: LucideIcons.bluetooth,
-                      title: '蓝牙设备',
-                      onTap: () => pushRoute(ref, 'devices'),
-                    ),
+                    if (!Platform.isIOS)
+                      _SettingsTile(
+                        icon: LucideIcons.bluetooth,
+                        title: '蓝牙设备',
+                        onTap: () => pushRoute(ref, 'devices'),
+                      ),
                     _SettingsTile(
                       icon: LucideIcons.bell,
                       title: '消息通知',