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/Telegram/CreateLinkTokenCommandHandlerTests.cs

@@ -13,7 +13,10 @@ public class CreateLinkTokenCommandHandlerTests
         using var dbContext = InMemoryDbContextFactory.Create();
         var userId = Guid.NewGuid();
 
-        var handler = new CreateLinkTokenCommandHandler(dbContext, FakeCurrentUser.Authenticated(userId));
+        var handler = new CreateLinkTokenCommandHandler(
+            dbContext,
+            FakeCurrentUser.Authenticated(userId)
+        );
 
         var result = await handler.Handle(new CreateLinkTokenCommand(), CancellationToken.None);