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/vite.config.ts

@@ -1,10 +1,29 @@
-import { defineConfig } from 'vite'
+import { defineConfig, type Plugin } from 'vite'
 import react from '@vitejs/plugin-react'
 import tailwindcss from '@tailwindcss/vite'
 import path from 'path'
 
+/** 避免 /demo-shop/ 被 SPA 回退成 React，导致 404；改为提供 public 静态页 */
+function demoShopStatic(): Plugin {
+  return {
+    name: 'demo-shop-static',
+    configureServer(server) {
+      // 必须挂在内部中间件之前，否则会先进 React SPA
+      server.middlewares.use((req, _res, next) => {
+        const raw = req.url || ''
+        const pathname = raw.split('?')[0]
+        if (pathname === '/demo-shop' || pathname === '/demo-shop/') {
+          const qs = raw.includes('?') ? raw.slice(raw.indexOf('?')) : ''
+          req.url = `/demo-shop/index.html${qs}`
+        }
+        next()
+      })
+    },
+  }
+}
+
 export default defineConfig({
-  plugins: [react(), tailwindcss()],
+  plugins: [react(), tailwindcss(), demoShopStatic()],
   resolve: {
     alias: {
       '@': path.resolve(__dirname, 'src'),