fix(download): 增加分块请求失败时的日志输出

在分块下载请求失败时，打印具体错误信息和重试次数，便于调试网络问题

Author: kazukokawagawa

native/tools/src/download.rs

@@ -407,8 +407,9 @@ async fn download_multi_stream(
                                 break; 
                             }
                         },
-                        Err(_) => {
+                        Err(e) => {
                             // 请求失败
+                            println!("[Download] Chunk request failed on attempt {}: {}", attempts + 1, e);
                         }
                     }