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/Admin/Users/ListUsersQueryHandler.cs

@@ -7,12 +7,20 @@ namespace PnvPanel.Application.Admin.Users;
 public sealed class ListUsersQueryHandler(IIdentityService identityService)
     : IQueryHandler<ListUsersQuery, Result<PagedList<UserSummaryDto>>>
 {
-    public async Task<Result<PagedList<UserSummaryDto>>> Handle(ListUsersQuery query, CancellationToken cancellationToken)
+    public async Task<Result<PagedList<UserSummaryDto>>> Handle(
+        ListUsersQuery query,
+        CancellationToken cancellationToken
+    )
     {
         var page = query.Page <= 0 ? 1 : query.Page;
         var pageSize = query.PageSize is <= 0 or > 100 ? 20 : query.PageSize;
 
-        var result = await identityService.ListUsersAsync(page, pageSize, query.Search, cancellationToken);
+        var result = await identityService.ListUsersAsync(
+            page,
+            pageSize,
+            query.Search,
+            cancellationToken
+        );
         return Result.Success(result);
     }
 }