新增: MySQL/SSH 代理工具

- mysql-proxy: MySQL HTTP 代理，连接池复用
- ssh-proxy: SSH HTTP 代理，会话复用
- mysql-cli: 轻量级 MySQL CLI 工具

功能特性:
- 延迟初始化，启动快
- CLI 和 HTTP API 双模式
- 请求日志支持
- 错误友好提示
- JSON 极简输出格式

mysql-cli/Cargo.toml

@@ -0,0 +1,34 @@
+[package]
+name = "mysql-cli"
+version = "0.1.0"
+edition = "2021"
+description = "A lightweight MySQL command-line tool written in Rust"
+
+[dependencies]
+# MySQL driver
+mysql = "25"
+
+# Command line argument parsing
+clap = { version = "4", features = ["derive"] }
+
+# REPL with history and completion
+rustyline = { version = "14", features = ["derive"] }
+
+# Serialization
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+
+# CSV output
+csv = "1"
+
+# Error handling
+anyhow = "1"
+thiserror = "1"
+
+# Check if stdin is a tty
+atty = "0.2"
+
+[profile.release]
+opt-level = "z"
+lto = true
+strip = true