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/public/sessions_controller.rb

@@ -1,14 +1,22 @@
 module Public
   class SessionsController < WebBaseController
     def new
-      redirect_to public_team_dashboard_path(current_user.teams.first) if logged_in? && current_user.teams.any?
+      if logged_in? && current_user.primary_club
+        redirect_to public_club_path(current_user.primary_club)
+      end
     end
 
     def create
       user = User.find_by(email: params[:email]&.downcase)
       if user&.authenticate(params[:password])
         session[:user_id] = user.id
-        dest = user.teams.first ? public_team_dashboard_path(user.teams.first) : new_public_team_path
+        dest = if user.primary_club
+                 public_club_path(user.primary_club)
+               elsif user.manageable_teams.first
+                 public_team_dashboard_path(user.manageable_teams.first)
+               else
+                 public_new_club_path
+               end
         redirect_to dest, notice: "Bentornato!"
       else
         flash.now[:alert] = "Email o password non validi"