fix(mp): setTimeout 无清理修复 — useSafeTimeout hook + 10 页面接入

新增 useSafeTimeout hook，页面隐藏时自动清理所有定时器。
10 个页面接入：daily-monitoring、exchange、family-add、
health/input、prescription detail/create、dialysis detail/create、
appointment detail/create。所有 fire-and-forget setTimeout 替换为
safeSetTimeout，避免页面切走后定时器回调在错误上下文执行。

apps/miniprogram/src/pages/pkg-profile/family-add/index.tsx

@@ -3,6 +3,7 @@ import { View, Text, Input, Picker } from '@tarojs/components';
 import Taro, { useRouter } from '@tarojs/taro';
 import { createPatient, updatePatient, Patient } from '../../../services/patient';
 import { useElderClass } from '../../../hooks/useElderClass';
+import { useSafeTimeout } from '@/hooks/useSafeTimeout';
 import './index.scss';
 
 const RELATION_OPTIONS = ['本人', '配偶', '父母', '子女', '其他'];
@@ -23,6 +24,7 @@ export default function FamilyAdd() {
   );
   const [birthDate, setBirthDate] = useState(editData?.birth_date || '');
   const [submitting, setSubmitting] = useState(false);
+  const { safeSetTimeout } = useSafeTimeout();
 
   useEffect(() => {
     return () => { Taro.removeStorageSync('edit_patient'); };
@@ -54,7 +56,7 @@ export default function FamilyAdd() {
         Taro.hideLoading();
         Taro.showToast({ title: '添加成功', icon: 'success' });
       }
-      setTimeout(() => Taro.navigateBack(), 1000);
+      safeSetTimeout(() => Taro.navigateBack(), 1000);
     } catch {
       Taro.hideLoading();
       Taro.showToast({ title: editId ? '修改失败' : '添加失败', icon: 'none' });