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-20250908-163158.log

@@ -0,0 +1,26 @@
+
+> n8n-monorepo@1.109.2 start /Users/xiaoqi/Documents/Dev/Project/2025-09-08_n8nDEMO演示/n8n-n8n-1.109.2
+> run-script-os
+
+
+> n8n-monorepo@1.109.2 start:default
+> cd packages/cli/bin && ./n8n
+
+Permissions 0644 for n8n settings file /Users/xiaoqi/.n8n/config are too wide. This is ignored for now, but in the future n8n will attempt to change the permissions automatically. To automatically enforce correct permissions now set N8N_ENFORCE_SETTINGS_FILE_PERMISSIONS=true (recommended), or turn this check off set N8N_ENFORCE_SETTINGS_FILE_PERMISSIONS=false.
+Initializing n8n process
+n8n ready on ::, port 5678
+n8n Task Broker ready on 127.0.0.1, port 5679
+Initializing AuthRolesService...
+AuthRolesService initialized successfully.
+[license SDK] Skipping renewal on init: license cert is not initialized
+Registered runner "JS Task Runner" (4cCbV_Z_J_3qoaQmjw7fB) 
+Version: 1.109.2
+Locale: zh-CN
+
+Editor is now accessible via:
+http://localhost:5678
+Received SIGINT. Shutting down...
+[Task Runner]: Received SIGINT signal, shutting down...
+[Task Runner]: Task runner stopped
+
+Stopping n8n...