fix: 更新 ImageMessage 的 URL 处理逻辑，修复日志记录方式并移除冗余日志

util/url.go

@@ -65,11 +65,6 @@ func normalizeURL(rawURL string) string {
 
 // DownloadFile 下载文件到指定目录，返回带有正确扩展名的完整文件路径
 func DownloadFile(url string, dirPath string) (filepath string, err error) {
-
-	url = strings.ReplaceAll(url, ",", ",")
-	url = strings.ReplaceAll(url, "[", "[")
-	url = strings.ReplaceAll(url, "]", "]")
-	url = strings.ReplaceAll(url, "&", "&")
 	// 发送 HTTP GET 请求
 	var resp *http.Response
 	var maxRetry = 100