App: scelta canale YouTube MLTV/società, privacy e condivisione link.

Premium Full può forzare il canale piattaforma; visibilità non in elenco o privato;
share_url unificato per Match Live TV e YouTube.

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

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

@@ -71,6 +71,7 @@ module Api
       def team_json(team, detail: false)
         ent = team.entitlements
         yt = Youtube::TeamStatus.new(team)
+        resolver = Youtube::CredentialResolver.new(team)
         data = {
           id: team.id,
           name: team.name,
@@ -84,6 +85,9 @@ module Api
           youtube_selectable: yt.selectable?,
           youtube_channel_title: yt.channel_title,
           youtube_uses_platform_channel: yt.uses_platform_channel?,
+          youtube_platform_available: resolver.platform_available?,
+          youtube_team_channel_available: resolver.team_channel_available?,
+          youtube_team_channel_title: team.youtube_credential&.channel_title,
           plan_slug: ent.plan.slug,
           plan_name: ent.plan.name,
           premium_active: ent.premium_active?,