fix(upload_images): 优化临时文件处理与图片上传提示

- 上传图片后删除oss上传的临时文件，防止文件残留
- 选择上传方式时修正相册最大数量提示，避免显示null
- 压缩图片时创建临时目录存储压缩文件，提升文件管理安全性
- 保留压缩文件以供后续使用，避免压缩后文件被误删

lib/upload_image/ossUtil.dart

@@ -77,6 +77,8 @@ class UploadOss {
       );
       print("response ===== $response");
       EasyLoading.dismiss();
+      /// 删除临时文件
+      File(path).deleteSync();
       // 成功后返回文件访问路径
       return "$ossHost/$ossDirectory$pathName";
     } on DioError catch (e) {

lib/upload_image/upload_images_tool.dart

@@ -139,7 +139,7 @@ class UploadImagesTool {
                 )
               : CupertinoActionSheet(
                   title: const Text('上传图片'),
-                  message: (max == null || max == 0) ? null : Text('请选择上传方式\n相册最多${max ?? 9}张'),
+                  message: (max == null || max == 0) ? null : Text('请选择上传方式\n相册最多${max}张'),
                   actions: isAddOtherWidget != null
                       ? <Widget>[
                           isAddOtherWidget,
@@ -279,6 +279,8 @@ class UploadImagesTool {
       );
       chooseImages?.call([path]);
     } else {
+      /// 创建临时目录
+      final Directory tempDir = Directory.systemTemp.createTempSync('compressed_images_');
       final List<AssetEntity>? result = await AssetPicker.pickAssets(
         Get.context!,
         pickerConfig: AssetPickerConfig(maxAssets: max ?? 50),
@@ -293,12 +295,10 @@ class UploadImagesTool {
             final String extension = file.absolute.path.split('.').last;
             /// 压缩并保存到临时文件
             final XFile? compressedFile = await FlutterImageCompress.compressAndGetFile(
-                file.absolute.path, '${file.parent.path}/${DateTime.now().millisecondsSinceEpoch}_compressed.$extension',
+                file.absolute.path, '${tempDir.path}/${DateTime.now().millisecondsSinceEpoch}_compressed.$extension',
                 quality: 80, minWidth: 1920, minHeight: 1080);
             if (compressedFile != null) {
               selectedFiles.add(compressedFile);
-              /// 删除临时文件
-              File(compressedFile.path).deleteSync();
             }
           }
         }