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/models/youtube/platform_credential.rb

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+module Youtube
+  # Credenziali del canale YouTube Match Live TV (Premium Light), da ENV.
+  class PlatformCredential
+    attr_accessor :access_token, :expires_at
+
+    def refresh_token
+      ENV["YOUTUBE_PLATFORM_REFRESH_TOKEN"].presence
+    end
+
+    def expired?
+      expires_at.present? && expires_at < Time.current
+    end
+
+    def update!(attrs)
+      self.access_token = attrs[:access_token] if attrs.key?(:access_token)
+      self.expires_at = attrs[:expires_at] if attrs.key?(:expires_at)
+    end
+
+    def self.configured?
+      ENV["YOUTUBE_PLATFORM_REFRESH_TOKEN"].present?
+    end
+  end
+end