feat(ai): 新增 AI 客服聊天功能 + 消息页重构为小华助手

- 新增 POST /ai/chat 端点，由 LLM（Ollama qwen3）担任 24h 健康客服"小华"
- 新增 ai.chat.send 权限，绑定管理员/患者/医生/护士/健康管理师角色
- 消息页从咨询列表重构为单窗口 AI 对话（欢迎态 + 聊天态 + 快捷问诊）
- 通知功能迁移到"我的"页面菜单项（带未读角标），独立通知列表页
- 修复气泡文字截断：改用百分比 max-width + block Text + pre-wrap 换行
- 修复权限绑定：迁移 SQL 角色名从英文改为中文（admin→管理员，patient→患者）

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

@@ -6,6 +6,7 @@ import { usePointsStore } from '../../stores/points';
 import { useUIStore } from '../../stores/ui';
 import { navigateToLogin } from '../../utils/navigate';
 import { usePageData } from '@/hooks/usePageData';
+import { notificationService } from '@/services/notification';
 import Loading from '../../components/Loading';
 import PageShell from '@/components/ui/PageShell';
 import ContentCard from '@/components/ui/ContentCard';
@@ -91,12 +92,18 @@ export default function Profile() {
   const isGuest = !user;
   const groups = isGuest ? GUEST_GROUPS : LOGGED_IN_GROUPS;
   const [pointsLoading, setPointsLoading] = useState(false);
+  const [unreadCount, setUnreadCount] = useState(0);
 
   const fetchPoints = useCallback(async () => {
     if (!isGuest) {
       setPointsLoading(true);
       await refreshPoints();
       setPointsLoading(false);
+      try {
+        const res = await notificationService.list<{ total?: number; data?: { read?: boolean }[] }>({ page: 1, page_size: 50 });
+        const items = (res as { data?: { read?: boolean }[] })?.data || [];
+        setUnreadCount(items.filter((n) => !n.read).length);
+      } catch { /* ignore */ }
     }
   }, [isGuest, refreshPoints]);
 
@@ -171,6 +178,29 @@ export default function Profile() {
         </>
       )}
 
+      {/* 消息通知入口 */}
+      {!isGuest && (
+        <View className='menu-group'>
+          <ContentCard
+            padding="none"
+            onPress={() => Taro.navigateTo({ url: '/pages/pkg-profile/notifications/index' })}
+          >
+            <View className='menu-item'>
+              <View className='menu-icon menu-icon--pri-l'>
+                <Text className='menu-icon-text menu-icon-text--pri'>讯</Text>
+              </View>
+              <Text className='menu-label'>消息通知</Text>
+              {unreadCount > 0 && (
+                <View className='menu-badge'>
+                  <Text className='menu-badge-text'>{unreadCount > 99 ? '99+' : unreadCount}</Text>
+                </View>
+              )}
+              <Text className='menu-arrow'>›</Text>
+            </View>
+          </ContentCard>
+        </View>
+      )}
+
       {/* 分组菜单 */}
       {groups.map((group) => (
         <View className='menu-group' key={group.title}>