refactor(service): 重构服务代码结构并更新配置

service/file_detect.go

@@ -11,7 +11,7 @@ func DetectFileType(data []byte) (contentType string, ext string) {
 		return "application/octet-stream", ""
 	}
 	ct := http.DetectContentType(data)
-	// http.DetectContentType 可能带 charset 等参数：text/plain; charset=utf-8
+	// gateway.DetectContentType 可能带 charset 等参数：text/plain; charset=utf-8
 	if idx := strings.Index(ct, ";"); idx > 0 {
 		ct = strings.TrimSpace(ct[:idx])
 	}