feat: [阶段1] 项目初始化和基础设置

- 创建 Cargo.toml 配置文件，包含所有必要依赖
- 建立完整的项目模块结构（config, models, handlers, routes, services, storage, middleware, utils）
- 实现用户数据模型和内存存储
- 创建基础的 HTTP 处理器和路由配置
- 添加错误处理和 JWT 认证中间件
- 配置环境变量和日志系统
- 创建项目文档和学习指南
- 服务器可以成功编译和启动

Cargo.toml

@@ -0,0 +1,44 @@
+[package]
+name = "rust-user-api"
+version = "0.1.0"
+edition = "2021"
+authors = ["Your Name <your.email@example.com>"]
+description = "A REST API server for user management built with Rust and Axum"
+
+[dependencies]
+# Web 框架
+axum = "0.7"
+tokio = { version = "1.0", features = ["full"] }
+tower = "0.4"
+tower-http = { version = "0.5", features = ["cors", "trace"] }
+
+# 序列化
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+
+# 时间处理
+chrono = { version = "0.4", features = ["serde"] }
+
+# UUID 生成
+uuid = { version = "1.0", features = ["v4", "serde"] }
+
+# 环境变量
+dotenv = "0.15"
+
+# 日志
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+
+# 密码哈希
+bcrypt = "0.15"
+
+# JWT 认证
+jsonwebtoken = "9.0"
+
+# 验证
+validator = { version = "0.16", features = ["derive"] }
+
+# HTTP 客户端（用于测试）
+[dev-dependencies]
+reqwest = { version = "0.11", features = ["json"] }
+tokio-test = "0.4"