fix: allow super admin tenant-scoped role ops

src/Application/TakeoutSaaS.Application/Identity/Handlers/UpdateRoleCommandHandler.cs

@@ -17,7 +17,7 @@ public sealed class UpdateRoleCommandHandler(
     public async Task<RoleDto?> Handle(UpdateRoleCommand request, CancellationToken cancellationToken)
     {
         // 1. 获取租户上下文并查询角色
-        var tenantId = tenantProvider.GetCurrentTenantId();
+        var tenantId = request.TenantId ?? tenantProvider.GetCurrentTenantId();
         var role = await roleRepository.FindByIdAsync(request.RoleId, tenantId, cancellationToken);
         if (role == null)
         {