初始化 fanyi 翻译 CLI 项目

- 项目从 fyy 更名为 fanyi
- 添加 clap 命令行参数解析
- 实现语言检测功能
- 配置异步运行时和 HTTP 客户端依赖
- 创建 TUTORIAL.md 教学计划文档

Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "fanyi"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+clap = { version = "4.5.59", features = ["derive"] }
+reqwest = { version = "0.13", features = ["json"] }
+tokio = { version = "1", features = ["full"] }
+serde = { version = "1.0.228", features = ["derive"] }
+serde_json = "1.0"