fix(miniprogram): 多角色找茬模式发现并修复 16 个问题

P0 Bug:
- 健康 AI 建议幽灵路径 pkg-appointment → appointment/create
- 血糖 indicator_type 始终 blood_sugar，不区分空腹/餐后
- 商城订单页 switchTab 跳转非 TabBar 页面

P1 设计系统:
- Profile/Index 页 emoji 图标替换为衬线首字
- Profile 硬编码颜色替换为 SCSS 变量 class
- alerts/action-inbox 两个页面全面接入设计系统
- ai-report/detail 删除重复 mixin 定义
- ErrorBoundary 添加重试按钮移除 emoji
- 新增 $r-xs: 8px 圆角变量

P1 导航/交互:
- Profile 补充 4 个缺失菜单（透析/知情同意/用药/活动）
- Settings 隐私政策改为跳转实际页面
- 全局启用 enablePullDownRefresh
- 首页/健康页添加下拉刷新
- 咨询/消息列表添加分页加载更多
- 医生端患者列表改为上拉加载
- 首页/健康页间距统一为 24px

apps/miniprogram/src/pages/messages/index.tsx

@@ -1,6 +1,6 @@
-import { useState } from 'react';
+import { useState, useRef } from 'react';
 import { View, Text } from '@tarojs/components';
-import Taro, { useDidShow } from '@tarojs/taro';
+import Taro, { useDidShow, useReachBottom } from '@tarojs/taro';
 import { listConsultations, ConsultationSession } from '../../services/consultation';
 import { notificationService } from '../../services/notification';
 import Loading from '../../components/Loading';
@@ -21,34 +21,62 @@ export default function Messages() {
   const [sessions, setSessions] = useState<ConsultationSession[]>([]);
   const [notifications, setNotifications] = useState<NotificationItem[]>([]);
   const [loading, setLoading] = useState(false);
+  const [page, setPage] = useState(1);
+  const [total, setTotal] = useState(0);
+  const loadingRef = useRef(false);
 
   useDidShow(() => {
-    loadData(activeTab);
+    loadData(activeTab, 1, true);
   });
 
-  const loadData = async (tab: MsgTab) => {
+  const loadData = async (tab: MsgTab, pageNum: number = 1, isRefresh = false) => {
+    if (loadingRef.current) return;
+    loadingRef.current = true;
     setLoading(true);
     try {
       if (tab === 'consultation') {
-        const res = await listConsultations({ page: 1, page_size: 20 });
-        setSessions(res.data || []);
+        const res = await listConsultations({ page: pageNum, page_size: 20 });
+        const list = res.data || [];
+        if (isRefresh) {
+          setSessions(list);
+        } else {
+          setSessions((prev) => [...prev, ...list]);
+        }
+        setTotal(res.total || 0);
       } else {
-        const res = await notificationService.list<{ data: unknown[] }>({ page: 1, page_size: 20 });
-        setNotifications((res as { data?: unknown[] })?.data || []);
+        const res = await notificationService.list<{ data: unknown[]; total?: number }>({ page: pageNum, page_size: 20 });
+        const list = (res as { data?: unknown[] })?.data || [];
+        if (isRefresh) {
+          setNotifications(list as NotificationItem[]);
+        } else {
+          setNotifications((prev) => [...prev, ...(list as NotificationItem[])]);
+        }
+        setTotal((res as { total?: number })?.total || 0);
       }
+      setPage(pageNum);
     } catch {
-      if (tab === 'consultation') setSessions([]);
-      else setNotifications([]);
+      if (isRefresh) {
+        if (tab === 'consultation') setSessions([]);
+        else setNotifications([]);
+      }
     } finally {
       setLoading(false);
+      loadingRef.current = false;
     }
   };
 
   const handleTabChange = (tab: MsgTab) => {
     setActiveTab(tab);
-    loadData(tab);
+    loadData(tab, 1, true);
   };
 
+  useReachBottom(() => {
+    const currentList = activeTab === 'consultation' ? sessions : notifications;
+    if (!loading && currentList.length < total) {
+      loadData(activeTab, page + 1);
+    }
+  });
+
   const formatTime = (dateStr: string | null) => {
     if (!dateStr) return '';
     const d = new Date(dateStr);