Support lists exclusive param

Signed-off-by: nicole mikołajczyk <git@mkljczk.pl>

priv/repo/migrations/20260218000000_add_exclusive_to_lists.exs

@@ -0,0 +1,9 @@
+defmodule Pleroma.Repo.Migrations.AddExclusiveToLists do
+  use Ecto.Migration
+
+  def change do
+    alter table(:lists) do
+      add(:exclusive, :boolean, default: false)
+    end
+  end
+end