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>

.claude/settings.local.json

@@ -70,7 +70,9 @@
       "Bash(open index.html)",
       "Bash(git push:*)",
       "Bash(sed:*)",
-      "Bash(/Users/xiaoqi/Documents/Dev/Project/2025-09-08_n8nDEMO演示/n8n-n8n-1.109.2/start.bat)"
+      "Bash(/Users/xiaoqi/Documents/Dev/Project/2025-09-08_n8nDEMO演示/n8n-n8n-1.109.2/start.bat)",
+      "Bash(curl:*)",
+      "Bash(node server.js)"
     ],
     "defaultMode": "acceptEdits",
     "additionalDirectories": [