docs: 添加项目文档包括总览、架构、流程引擎和服务层

新增以下文档文件:
- PROJECT_OVERVIEW.md 项目总览文档
- BACKEND_ARCHITECTURE.md 后端架构文档
- FRONTEND_ARCHITECTURE.md 前端架构文档
- FLOW_ENGINE.md 流程引擎文档
- SERVICES.md 服务层文档
- ERROR_HANDLING.md 错误处理模块文档

文档内容涵盖项目整体介绍、技术架构、核心模块设计和实现细节
This commit is contained in:
2025-09-24 20:21:45 +08:00
parent 6ff587dc23
commit a3f2f99a68
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docs/MIDDLEWARES.md Normal file

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