Stabilizza live YouTube/RTMP e fix crash rotazione mobile.

Pipeline YouTube con relay, overlay e publisher sync lato backend; fix GL pauseGlDuringRotation su Android per evitare crash in rotazione durante lo streaming Flutter.

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

backend/app/jobs/youtube_ingest_watchdog_job.rb

@@ -0,0 +1,57 @@
+# Controlli ripetuti finché YouTube non ha ingest active (poi attiva la broadcast).
+class YoutubeIngestWatchdogJob < ApplicationJob
+  queue_as :default
+
+  FIRST_WAIT = 20.seconds
+  NEXT_WAITS = [35.seconds, 45.seconds, 60.seconds].freeze
+
+  def perform(session_id, phase = 0)
+    session = StreamSession.find_by(id: session_id)
+    return unless Youtube::LivePipeline.broadcast_ready?(session)
+    return if Youtube::ApiThrottle.rate_limited?
+
+    ingest = youtube_ingest_status(session)
+    if ingest == "active"
+      Youtube::LivePipeline.schedule_activate!(session, force: true, wait: 3.seconds)
+      return
+    end
+
+    if Streams::YoutubeRelay.running?(session.id)
+      Rails.logger.info("[YoutubeIngestWatchdog] relay ok ingest=#{ingest} phase=#{phase} session=#{session.id}")
+    else
+      Rails.logger.warn("[YoutubeIngestWatchdog] avvio relay ingest=#{ingest} session=#{session.id}")
+      Streams::YoutubeRelay.ensure_publishing!(session)
+    end
+
+    schedule_next(session_id, phase)
+  rescue StandardError => e
+    Rails.logger.warn("[YoutubeIngestWatchdog] session=#{session_id}: #{e.message}")
+    schedule_next(session_id, phase)
+  end
+
+  def self.schedule_chain(session_id)
+    set(wait: FIRST_WAIT).perform_later(session_id, 0)
+  end
+
+  private
+
+  def schedule_next(session_id, phase)
+    wait = NEXT_WAITS[phase]
+    return unless wait
+
+    self.class.set(wait: wait).perform_later(session_id, phase + 1)
+  end
+
+  def youtube_ingest_status(session)
+    return nil if session.youtube_broadcast_id.blank?
+
+    client = Youtube::BroadcastService.new(session.match.team).send(:authorized_client)
+    b = client.list_live_broadcasts("status,contentDetails", id: session.youtube_broadcast_id).items&.first
+    return nil unless b
+
+    sid = b.content_details.bound_stream_id
+    client.list_live_streams("status", id: sid).items.first&.status&.stream_status
+  rescue StandardError
+    nil
+  end
+end