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/mall/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, { useReachBottom, usePullDownRefresh } from '@tarojs/taro';
-import { useThrottledDidShow } from '@/hooks/useThrottledDidShow';
+import Taro, { useReachBottom } from '@tarojs/taro';
+import { usePageData } from '@/hooks/usePageData';
 import { listProducts } from '../../services/points';
 import type { PointsProduct } from '../../services/points';
 import { useAuthStore } from '../../stores/auth';
@@ -37,13 +37,10 @@ export default function Mall() {
   const [loading, setLoading] = useState(false);
   const [checkinLoading, setCheckinLoading] = useState(false);
   const [noProfile, setNoProfile] = useState(false);
-  const loadingRef = useRef(false);
   const modeClass = useElderClass();
 
   const fetchProducts = useCallback(
     async (pageNum: number, type: string, isRefresh = false) => {
-      if (loadingRef.current) return;
-      loadingRef.current = true;
       setLoading(true);
       try {
         const res = await listProducts({
@@ -62,7 +59,6 @@ export default function Mall() {
       } catch {
         Taro.showToast({ title: '加载失败', icon: 'none' });
       } finally {
-        loadingRef.current = false;
         setLoading(false);
       }
     },
@@ -87,16 +83,13 @@ export default function Mall() {
     [currentPatient, loadPatients, refreshPoints, fetchProducts, productType],
   );
 
-  useThrottledDidShow(() => {
-    Taro.setNavigationBarTitle({ title: '积分商城' });
-    loadAll();
-  }, 10000);
-
-  usePullDownRefresh(() => {
-    loadAll().finally(() => {
-      Taro.stopPullDownRefresh();
-    });
-  });
+  usePageData(
+    useCallback(async () => {
+      Taro.setNavigationBarTitle({ title: '积分商城' });
+      await loadAll();
+    }, [loadAll]),
+    { throttleMs: 10000, enablePullDown: true },
+  );
 
   useReachBottom(() => {
     if (!loading && products.length < total) {