feat: 咨询消息轮询优化 — Web 自动刷新 + 患者端聊天详情页

Web 端:
- ConsultationDetail 添加 10s 自动轮询新消息（after_id 增量拉取）
- consultations API 补充 after_id 参数

小程序患者端:
- 新增 consultation service 消息 API（listMessages/sendMessage/markSessionRead）
- 新增聊天详情页（8s 轮询 + 发送消息 + 自动标记已读）
- 咨询列表页点击跳转详情页（替换"即将上线"占位）

apps/web/src/api/health/consultations.ts

@@ -86,7 +86,7 @@ export const consultationApi = {
 
   listMessages: async (
     sessionId: string,
-    params: { page?: number; page_size?: number },
+    params: { page?: number; page_size?: number; after_id?: string },
   ) => {
     const { data } = await client.get<{
       success: boolean;

apps/web/src/pages/health/ConsultationDetail.tsx

@@ -9,6 +9,7 @@ import { useThemeMode } from '../../hooks/useThemeMode';
 import { AuthButton } from '../../components/AuthButton';
 
 const PAGE_SIZE = 30;
+const POLL_INTERVAL = 10_000;
 
 function formatTime(value: string): string {
   return new Date(value).toLocaleString('zh-CN', {
@@ -54,6 +55,7 @@ export default function ConsultationDetail() {
 
   const chatEndRef = useRef<HTMLDivElement>(null);
   const shouldScrollRef = useRef(true);
+  const pollRef = useRef<ReturnType<typeof setInterval> | null>(null);
 
   const isDark = useThemeMode();
 
@@ -103,6 +105,39 @@ export default function ConsultationDetail() {
     fetchMessages(1, false);
   }, [fetchSession, fetchMessages]);
 
+  // Poll new messages while session is active
+  useEffect(() => {
+    if (!session || session.status === 'closed') return;
+
+    const stopPolling = () => {
+      if (pollRef.current) {
+        clearInterval(pollRef.current);
+        pollRef.current = null;
+      }
+    };
+
+    stopPolling();
+    pollRef.current = setInterval(async () => {
+      if (!sessionId) return;
+      try {
+        const lastId = messages.length > 0 ? messages[messages.length - 1].id : undefined;
+        const result = await consultationApi.listMessages(sessionId, {
+          page: 1,
+          page_size: 50,
+          after_id: lastId,
+        });
+        if (result.data.length > 0) {
+          setMessages((prev) => [...prev, ...result.data]);
+          shouldScrollRef.current = true;
+        }
+      } catch {
+        // silent
+      }
+    }, POLL_INTERVAL);
+
+    return stopPolling;
+  }, [session?.status, sessionId, messages.length]);
+
   // Auto-scroll to bottom on new messages
   useEffect(() => {
     if (shouldScrollRef.current && chatEndRef.current) {