fix: allow super admin tenant-scoped role ops

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

@@ -16,7 +16,7 @@ public sealed class BindRolePermissionsCommandHandler(
     public async Task<bool> Handle(BindRolePermissionsCommand request, CancellationToken cancellationToken)
     {
         // 1. 获取租户上下文
-        var tenantId = tenantProvider.GetCurrentTenantId();
+        var tenantId = request.TenantId ?? tenantProvider.GetCurrentTenantId();
 
         // 2. 覆盖式绑定权限
         await rolePermissionRepository.ReplaceRolePermissionsAsync(tenantId, request.RoleId, request.PermissionIds, cancellationToken);