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/src/PnvPanel.Application/Common/Messaging/ISender.cs

@@ -3,6 +3,12 @@ namespace PnvPanel.Application.Common.Messaging;
 /// <summary>Собственный тонкий CQRS-диспетчер (без MediatR).</summary>
 public interface ISender
 {
-    Task<TResponse> Send<TResponse>(ICommand<TResponse> command, CancellationToken cancellationToken = default);
-    Task<TResponse> Send<TResponse>(IQuery<TResponse> query, CancellationToken cancellationToken = default);
+    Task<TResponse> Send<TResponse>(
+        ICommand<TResponse> command,
+        CancellationToken cancellationToken = default
+    );
+    Task<TResponse> Send<TResponse>(
+        IQuery<TResponse> query,
+        CancellationToken cancellationToken = default
+    );
 }