Refactor file URL construction

Removed "wwwroot" from the file path in the
ConstructFileUrl method to simplify the URL structure
for accessing uploaded files.

Author: Abdelrahman984

Helpers/ConstructFileUrlHelper.cs

@@ -7,7 +7,7 @@ public static string ConstructFileUrl(HttpRequest request, string folder, string
         {
             //Request.Scheme = hhtp/https - Request.Host = localhost:5000 or example.com - Path.GetFileName(lesson.ThumbnailUrl) = Example: image1.jpg
             //For example: https://localhost:5000/lesson-thumbnails/image1.jpg
-            return $"{request.Scheme}://{request.Host}/wwwroot/uploads/{folder}/{Path.GetFileName(fileName)}";
+            return $"{request.Scheme}://{request.Host}/uploads/{folder}/{Path.GetFileName(fileName)}";
         }
     }
 }