fix: 修复WorkflowPageV3组件TypeScript错误和清理副本文件

详细说明:
- 修复WorkflowPageV3.tsx中的TypeScript类型错误
- 移除未使用的executionTimeoutRef变量
- 修复style标签的jsx属性问题
- 将deprecated的substr()改为substring()
- 清理n8n目录下的副本文件
- 添加server.js和start脚本用于静态文件服务

影响的文件:
- web_frontend/exhibition-demo/src/pages/WorkflowPageV3.tsx
- web_frontend/exhibition-demo/src/components/ResultModal.tsx
- web_frontend/web_result/server.js (新增)
- web_frontend/web_result/start.bat (新增)
- web_frontend/web_result/start.sh (新增)

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

n8n-n8n-1.109.2/n8n-20250908-141135.log

@@ -22,3 +22,8 @@ http://localhost:5678
 (node:12101) [DEP0060] DeprecationWarning: The `util._extend` API is deprecated. Please use Object.assign() instead.
 (Use `node --trace-deprecation ...` to show where the warning was created)
 Node does not have any credentials set
+Received SIGINT. Shutting down...
+[Task Runner]: Received SIGINT signal, shutting down...
+[Task Runner]: Task runner stopped
+
+Stopping n8n...