优化: Keep-Alive/rate-limiter/dead-code清理 + deploy.sh蓝绿自动检测 + 压测文档

src/auth.rs

@@ -77,6 +77,7 @@ pub fn generate_refresh_token(user_id: i32, secret: &str) -> Result<String, Stri
 }
 
 // 解析 refresh_token，返回 (user_id, expires_at)
+#[allow(dead_code)]
 pub fn verify_refresh_token(token: &str, _secret: &str) -> Result<(i32, i64), String> {
     let decoded = BASE64.decode(token)
         .map_err(|e| format!("Refresh token 格式错误: {}", e))?;