Club come entità principale, branding e fix infrastruttura streaming.

Introduce clubs con abbonamento, branding Active Storage e flusso registrazione società; corregge healthcheck MediaMTX (immagine distroless) e allinea dominio produzione matchlivetv.it.

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

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

@@ -4,7 +4,7 @@ module Api
       before_action :set_session, except: :create
 
       def create
-        match = Match.joins(:team).merge(current_user.teams).find(params[:match_id])
+        match = Match.joins(:team).merge(current_user.manageable_teams).find(params[:match_id])
         session = Sessions::Create.new(user: current_user, match: match, params: session_params).call
         render json: session_json(session), status: :created
       end
@@ -102,7 +102,7 @@ module Api
 
       def set_session
         @session = StreamSession.joins(match: :team)
-                                .merge(current_user.teams)
+                                .merge(current_user.manageable_teams)
                                 .find(params[:id])
       end