docs: 创建专业的项目 README 文档

详细说明:
- 添加完整的项目介绍和架构说明
- 包含 7 个 AI Agent 的详细介绍
- 添加技术栈和 Mermaid 架构图
- 完善安装和使用指南
- 添加开发指南和 Git 工作流
- 新增 Windows 快速部署文档
- 更新前端组件和启动脚本
- 添加多种环境配置文件

修改的文件:
- 新增 README.md 主文档
- 新增 doc/ 目录及部署文档
- 更新前端演示系统组件
- 添加多个启动脚本变体
- 配置文件优化

影响的功能模块:
- 项目文档体系
- 部署和启动流程
- 前端展示系统
- 环境配置管理

n8n-n8n-1.109.2/n8n-20250914-033905.log

@@ -0,0 +1,29 @@
+
+> 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" (ytJpIM_Gno8mBYVVY08SV) 
+Version: 1.109.2
+Locale: zh-CN
+
+Editor is now accessible via:
+http://192.168.2.99:5678
+(node:37966) [DEP0060] DeprecationWarning: The `util._extend` API is deprecated. Please use Object.assign() instead.
+(Use `node --trace-deprecation ...` to show where the warning was created)
+Cannot set properties of undefined (setting 'runIndex')
+Received SIGINT. Shutting down...
+[Task Runner]: Received SIGINT signal, shutting down...
+[Task Runner]: Task runner stopped
+
+Stopping n8n...