Aggiunge copertina sponsor custom solo Premium Full, con override in wizard e slate sui nodi di streaming.

Permette upload da portale e app con ereditarietà partita→squadra→società, generazione MP4 via ffmpeg e distribuzione su home lab e nodi CPX per pause e assenza segnale.

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

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

@@ -137,7 +137,8 @@ module Api
           youtube_mode: ent.plan.youtube_mode,
           staff_role: current_user.staff_role_for(team),
           can_stream: current_user.can_stream_for?(team),
-          can_connect_youtube: team.club.owned_by?(current_user) && ent.premium_full? && ent.youtube_enabled?
+          can_connect_youtube: team.club.owned_by?(current_user) && ent.premium_full? && ent.youtube_enabled?,
+          custom_cover_enabled: ent.can_use_custom_cover?
         }
         if detail
           data[:members] = team.user_teams.includes(:user).where.not(role: "owner").map do |ut|