refactor(mp): 架构重构 — usePageData 统一数据加载 + Store 解耦 + 大页面拆分

新增 usePageData hook（useDidShow 节流 + usePullDownRefresh + loadingRef 防重入 + enabled 条件守卫），
44/58 页面迁移接入，消灭 4 种数据加载模式并存。

- 新增 hooks/usePageData.ts — 统一页面数据加载生命周期
- 新增 stores/index.ts — resetAllStores() 解耦 auth↔health store 依赖
- 新增 pages/index/useHomeData.ts — 首页数据 hook（424→282 行）
- 新增 pages/health/useHealthData.ts — 健康页数据 hook（422→254 行）
- 44 个页面迁移到 usePageData（9 患者端 + 15 医生端 + 20 子包）
- auth store logout 不再直接导入 health store

构建通过，测试 74/75（1 个预存失败）。

apps/miniprogram/src/pages/pkg-health/alerts/index.tsx

@@ -1,7 +1,7 @@
-import React, { useState, useCallback, useRef } from 'react';
+import React, { useState, useCallback } from 'react';
 import { View, Text } from '@tarojs/components';
-import Taro, { usePullDownRefresh } from '@tarojs/taro';
-import { useThrottledDidShow } from '@/hooks/useThrottledDidShow';
+import Taro from '@tarojs/taro';
+import { usePageData } from '@/hooks/usePageData';
 import { listPatientAlerts, type Alert } from '@/services/alert';
 import { useAuthStore } from '@/stores/auth';
 import Loading from '@/components/Loading';
@@ -30,12 +30,10 @@ export default function PatientAlerts() {
   const [page, setPage] = useState(1);
   const [status, setStatus] = useState('');
   const [loading, setLoading] = useState(false);
-  const loadingRef = useRef(false);
 
   const fetchAlerts = useCallback(
     async (pageNum: number, s: string, isRefresh = false) => {
-      if (!currentPatient || loadingRef.current) return;
-      loadingRef.current = true;
+      if (!currentPatient) return;
       setLoading(true);
       try {
         const res = await listPatientAlerts(currentPatient.id, {
@@ -54,21 +52,19 @@ export default function PatientAlerts() {
       } catch {
         Taro.showToast({ title: '加载失败', icon: 'none' });
       } finally {
-        loadingRef.current = false;
         setLoading(false);
       }
     },
     [currentPatient],
   );
 
-  useThrottledDidShow(() => {
-    Taro.setNavigationBarTitle({ title: '健康告警' });
-    fetchAlerts(1, status, true);
-  }, 10000);
-
-  usePullDownRefresh(() => {
-    fetchAlerts(1, status, true).finally(() => Taro.stopPullDownRefresh());
-  });
+  usePageData(
+    async () => {
+      Taro.setNavigationBarTitle({ title: '健康告警' });
+      await fetchAlerts(1, status, true);
+    },
+    { throttleMs: 10000, enablePullDown: true },
+  );
 
   const handleTabChange = (key: string) => {
     setStatus(key);