Billing upgrade/downgrade, inviti in app e diretta YouTube da mobile.

Upgrade Stripe con addebito immediato; downgrade programmato a fine periodo.
UX billing più sobria con box info; icone piani. API inviti e OAuth YouTube
per staff trasmissione; deep link join; scelta partita programmata o nuova.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/controllers/api/v1/youtube_controller.rb

@@ -2,11 +2,18 @@ module Api
   module V1
     class YoutubeController < BaseController
       def authorize
-        team = current_user.manageable_teams.find(params[:team_id])
+        team = current_user.streamable_teams.find { |t| t.id.to_s == params[:team_id].to_s }
+        raise ActiveRecord::RecordNotFound unless team
+
         team.entitlements.assert_can_connect_youtube!
-        state = Youtube::OauthState.for_team(team_id: team.id, user_id: current_user.id)
+        return_app = ActiveModel::Type::Boolean.new.cast(params[:return_app])
+        state = Youtube::OauthState.for_team(
+          team_id: team.id,
+          user_id: current_user.id,
+          return_app: return_app
+        )
         url = Youtube::OauthUrl.build(state: state, redirect_uri: ENV.fetch("YOUTUBE_REDIRECT_URI"))
-        render json: { authorization_url: url }
+        render json: { authorization_url: url, return_app: return_app }
       end
     end
   end