Unifica admin società/squadre e YouTube Full con fallback MLTV.

Premium Full senza canale società usa il canale piattaforma come Light;
in app restano solo Match Live TV e YouTube Live.

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

backend/app/views/admin/dashboard/index.html.erb

@@ -123,7 +123,7 @@
       <% end %>
     </ul>
     <% if @stats[:teams_count] > @teams.size %>
-      <p class="kpi-sub" style="margin-top:0.75rem"><%= link_to "Vedi tutte (#{@stats[:teams_count]})", admin_teams_path %></p>
+      <p class="kpi-sub" style="margin-top:0.75rem"><%= link_to "Vedi società (#{@stats[:teams_count]} squadre)", admin_clubs_path %></p>
     <% end %>
   </div>
 </section>