fix(admin): 统一jpe/jpeg扩展名为jpg

检测到文件MIME类型对应的扩展名为jpe或jpeg时，统一转换为更常见的jpg格式，确保后续文件路径处理的一致性。

app/admin/controller/File.php

@@ -104,6 +104,11 @@ class File extends Common
         $mime_type = $mime_detector->detectMimeTypeFromBuffer($file_data);
         $ext_name = array_search($mime_type, GeneratedExtensionToMimeTypeMap::MIME_TYPES_FOR_EXTENSIONS);
 
+        // jpe/jpeg 统一为更常见的 jpg
+        if ($ext_name === 'jpe' || $ext_name === 'jpeg') {
+            $ext_name = 'jpg';
+        }
+
         $public_file_path = '/temp_img/' . uniqid() . '.' . $ext_name;
 
         $temp_file = App::getRootPath() . 'public' . $public_file_path;