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/Activation/RejectActivationCommandHandlerTests.cs

@@ -25,7 +25,10 @@ public class RejectActivationCommandHandlerTests
 
         var handler = new RejectActivationCommandHandler(dbContext, _currentUser);
 
-        var result = await handler.Handle(new RejectActivationCommand(request.Id, "недостаточно информации"), CancellationToken.None);
+        var result = await handler.Handle(
+            new RejectActivationCommand(request.Id, "недостаточно информации"),
+            CancellationToken.None
+        );
 
         Assert.True(result.IsSuccess);
         Assert.Equal(ActivationStatus.Rejected, request.Status);
@@ -40,7 +43,10 @@ public class RejectActivationCommandHandlerTests
 
         var handler = new RejectActivationCommandHandler(dbContext, _currentUser);
 
-        var result = await handler.Handle(new RejectActivationCommand(Guid.NewGuid(), null), CancellationToken.None);
+        var result = await handler.Handle(
+            new RejectActivationCommand(Guid.NewGuid(), null),
+            CancellationToken.None
+        );
 
         Assert.False(result.IsSuccess);
         Assert.Equal(ActivationErrors.NotFound, result.Error);
@@ -59,7 +65,10 @@ public class RejectActivationCommandHandlerTests
 
         var handler = new RejectActivationCommandHandler(dbContext, _currentUser);
 
-        var result = await handler.Handle(new RejectActivationCommand(request.Id, null), CancellationToken.None);
+        var result = await handler.Handle(
+            new RejectActivationCommand(request.Id, null),
+            CancellationToken.None
+        );
 
         Assert.False(result.IsSuccess);
         Assert.Equal(ActivationErrors.AlreadyDecided, result.Error);