feat: add promoter payouts controller and routes

db/migrate/20250816145933_devise_create_users.rb

@@ -52,7 +52,8 @@ class DeviseCreateUsers < ActiveRecord::Migration[8.0]
       # Add onboarding check on user model
       t.boolean :onboarding_completed, default: false, null: false
 
-      # add_column :users, :stripe_connected_account_id, :string
+      # Link user to Stripe account for promoter payout
+      t.string :stripe_connected_account_id
 
       t.timestamps null: false
     end