Integrazione YouTube Live: OAuth squadra, canale piattaforma Light e UI.

Collegamento da Dettagli squadra e admin per il refresh token Match Live TV; API e app mobile allineate ai piani Light/Full.

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

backend/app/services/youtube/oauth_state.rb

@@ -0,0 +1,39 @@
+module Youtube
+  class OauthState
+    PURPOSE = :youtube_oauth_connect
+
+    class << self
+      def for_team(team_id:, user_id:)
+        verifier.generate([team_id.to_s, user_id.to_s], expires_in: 1.hour)
+      end
+
+      def for_platform(admin_id:)
+        verifier.generate(["platform", admin_id.to_s], expires_in: 1.hour)
+      end
+
+      def verify!(token)
+        payload = verifier.verify(token)
+        case payload
+        when Array
+          if payload.first == "platform"
+            { kind: :platform, admin_id: payload[1] }
+          elsif payload.size == 2
+            { kind: :team, team_id: payload[0], user_id: payload[1] }
+          else
+            raise ArgumentError, "stato OAuth non valido"
+          end
+        else
+          raise ArgumentError, "stato OAuth non valido"
+        end
+      rescue ActiveSupport::MessageVerifier::InvalidSignature
+        raise ArgumentError, "stato OAuth scaduto o non valido"
+      end
+
+      private
+
+      def verifier
+        Rails.application.message_verifier(PURPOSE)
+      end
+    end
+  end
+end