修复访客浏览轨迹延迟与排序，增加演示站

保留 SPA hash 以正确区分页面；延迟采集 title 避免慢一页；轨迹改为最新在上；补充 demo-shop 测试页与 Vite 静态路由。

web/src/widgets/VisitorChat.tsx

@@ -135,7 +135,7 @@ const VisitorChat = ({
     title: initialPage?.title || (typeof document !== 'undefined' ? document.title : ''),
     referrer: initialPage?.referrer || (typeof document !== 'undefined' ? document.referrer : ''),
   })
-  const lastPageURLRef = useRef('')
+  const lastPageKeyRef = useRef('') // url + title，避免同 URL 标题更新被吞
   /** 本地已同步到的最大 seq（从缓存消息初始化） */
   const lastSeqRef = useRef((() => {
     try {
@@ -315,11 +315,23 @@ const VisitorChat = ({
   const reportPageView = useCallback(async (url: string, title: string) => {
     const sid = sessionIdRef.current
     const token = visitorTokenRef.current
-    if (!sid || !token || !url || sessionEnded) return
-    if (url === lastPageURLRef.current) return
-    lastPageURLRef.current = url
+    if (!url) return
+    // 会话尚未 Init 完成：只缓存宿主页，避免丢掉打开前/初始化中的换页
+    if (!sid || !token) {
+      hostPageRef.current = {
+        ...hostPageRef.current,
+        url,
+        title: title || hostPageRef.current.title,
+      }
+      return
+    }
+    if (sessionEnded) return
+    const key = `${url}\0${title || ''}`
+    // 同 URL 但标题变了仍要上报（服务端会更新 current_title；新 URL 会插轨迹）
+    if (key === lastPageKeyRef.current) return
+    lastPageKeyRef.current = key
     try {
-      await fetch('/api/widget/pageview', {
+      const res = await fetch('/api/widget/pageview', {
         method: 'POST',
         headers: {
           'Content-Type': 'application/json',
@@ -332,8 +344,11 @@ const VisitorChat = ({
           page_title: title || '',
         }),
       })
+      if (!res.ok) {
+        lastPageKeyRef.current = ''
+      }
     } catch {
-      /* 轨迹失败不影响会话 */
+      lastPageKeyRef.current = ''
     }
   }, [sessionEnded])
 
@@ -378,9 +393,15 @@ const VisitorChat = ({
     localStorage.setItem(tokenKey, token)
     localStorage.removeItem(msgsKey)
     lastSeqRef.current = 0
-    if (page.url) lastPageURLRef.current = page.url
+    // init 已写入落地页；标记已上报，避免立刻重复；宿主若已换页则补报
+    const latest = hostPageRef.current
+    if (page.url) lastPageKeyRef.current = `${page.url}\0${page.title || ''}`
     await loadMessages(sid, token, { full: true })
-  }, [channelKey, loadMessages, storageKey, tokenKey, msgsKey])
+    if (latest.url && (latest.url !== page.url || (latest.title || '') !== (page.title || ''))) {
+      lastPageKeyRef.current = ''
+      void reportPageView(latest.url, latest.title || '')
+    }
+  }, [channelKey, loadMessages, storageKey, tokenKey, msgsKey, reportPageView])
 
   const closeSocket = useCallback(() => {
     const sock = socketRef.current