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/Support/ListSelectableRoles/ListSelectableRolesQuery.cs

@@ -6,4 +6,6 @@ namespace PnvPanel.Application.Support.ListSelectableRoles;
 
 /// <summary>Список ролей для выбора в заявке на роль (без admin) — в отличие от ListRolesQuery
 /// (Admin/Roles), доступен любому активированному пользователю.</summary>
-public sealed record ListSelectableRolesQuery : IQuery<Result<IReadOnlyList<RoleDto>>>, IRequiresActivation;
+public sealed record ListSelectableRolesQuery
+    : IQuery<Result<IReadOnlyList<RoleDto>>>,
+        IRequiresActivation;

backend/src/PnvPanel.Application/Support/ListSelectableRoles/ListSelectableRolesQueryHandler.cs

@@ -11,10 +11,15 @@ public sealed class ListSelectableRolesQueryHandler(IRoleService roleService)
     // CreateRoleRequestTicketCommandHandler (Application не может ссылаться на Infrastructure).
     private const string AdminRoleName = "admin";
 
-    public async Task<Result<IReadOnlyList<RoleDto>>> Handle(ListSelectableRolesQuery query, CancellationToken cancellationToken)
+    public async Task<Result<IReadOnlyList<RoleDto>>> Handle(
+        ListSelectableRolesQuery query,
+        CancellationToken cancellationToken
+    )
     {
         var roles = await roleService.ListRolesAsync(cancellationToken);
-        var selectable = roles.Where(r => !r.Name.Equals(AdminRoleName, StringComparison.OrdinalIgnoreCase)).ToList();
+        var selectable = roles
+            .Where(r => !r.Name.Equals(AdminRoleName, StringComparison.OrdinalIgnoreCase))
+            .ToList();
 
         return Result.Success<IReadOnlyList<RoleDto>>(selectable);
     }