Refactor project files for improved readability and structure

- Cleaned up whitespace in Directory.Build.props and Directory.Packages.props for consistency.
- Reformatted project file references in PnvPanel.Api.csproj for better clarity.
- Enhanced code readability in various endpoint files by adjusting line breaks and indentation.
- Standardized method signatures and improved formatting in ResultExtensions and multiple endpoint classes for better maintainability.

backend/tests/PnvPanel.Application.Tests/TestSupport/FakeCurrentUser.cs

@@ -10,8 +10,8 @@ public sealed class FakeCurrentUser : ICurrentUser
 
     public bool IsAuthenticated => UserId is not null;
 
-    public static FakeCurrentUser Authenticated(Guid userId, string userName = "testuser")
-        => new() { UserId = userId, UserName = userName };
+    public static FakeCurrentUser Authenticated(Guid userId, string userName = "testuser") =>
+        new() { UserId = userId, UserName = userName };
 
     public static FakeCurrentUser Anonymous() => new();
 }