switch install state to db

db/migrate/20260122131000_create_setup_states.rb

@@ -0,0 +1,10 @@
+class CreateSetupStates < ActiveRecord::Migration[8.1]
+  def change
+    create_table :setup_states do |t|
+      t.boolean :installed, null: false, default: false
+      t.datetime :installed_at
+
+      t.timestamps
+    end
+  end
+end