# 后端架构文档 ## 技术栈与理由 - Spring Boot/Cloud(成熟生态、易扩展) - MySQL(事务与一致性保障) - Redis(缓存与分布式特性) - MQ(削峰填谷、解耦) ## 服务划分 - Auth、User、RBAC、Workflow、Payment、Report、File 等 ## 时序示意(登录鉴权) ```mermaid sequenceDiagram participant C as Client participant G as API Gateway participant A as Auth Service C->>G: /auth/login G->>A: 认证请求 A-->>G: 令牌 G-->>C: 令牌返回 ```