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_broadcast_setup_job.rb

@@ -1,12 +1,61 @@
 class YoutubeBroadcastSetupJob < ApplicationJob
   queue_as :default
 
-  retry_on Youtube::SetupBroadcast::Error, wait: 10.seconds, attempts: 3
+  RUN_LOCK_KEY = "youtube_setup:running:%s"
+  MAX_RATE_LIMIT_ATTEMPTS = 15
+  RATE_LIMIT_WAITS = [30, 45, 60, 90, 120, 120, 120, 120, 120, 120, 120, 120, 120, 120, 120].freeze
 
-  def perform(session_id, youtube_channel = nil)
+  def perform(session_id, youtube_channel = nil, attempt = 1)
     session = StreamSession.find_by(id: session_id)
-    return unless session
+    return unless session&.platform == "youtube"
+    return if session.terminal?
+    return if session.youtube_broadcast_id.present? && session.stream_key.present?
+    return unless acquire_run_lock!(session_id, attempt)
 
     Youtube::SetupBroadcast.call(session, youtube_channel: youtube_channel.presence)
+    release_run_lock!(session_id)
+  rescue Youtube::SetupBroadcast::Error => e
+    if rate_limit?(e) && attempt < MAX_RATE_LIMIT_ATTEMPTS
+      Youtube::ApiThrottle.mark_rate_limited!
+      wait = RATE_LIMIT_WAITS[attempt - 1] || 120
+      extend_run_lock!(session_id, wait + 90)
+      Rails.logger.warn(
+        "[YoutubeBroadcastSetupJob] rate limit session=#{session_id} attempt=#{attempt} retry_in=#{wait}s"
+      )
+      self.class.set(wait: wait.seconds).perform_later(session_id, youtube_channel, attempt + 1)
+      return
+    end
+    release_run_lock!(session_id)
+    raise
+  end
+
+  private
+
+  def rate_limit?(error)
+    msg = error.message.to_s
+    msg.include?("rate limit") ||
+      msg.include?("userRequestsExceedRateLimit") ||
+      msg.include?("temporaneamente occupato")
+  end
+
+  def acquire_run_lock!(session_id, attempt)
+    key = format(RUN_LOCK_KEY, session_id)
+    if attempt > 1
+      return redis.exists?(key).positive?
+    end
+
+    redis.set(key, "1", nx: true, ex: 90)
+  end
+
+  def extend_run_lock!(session_id, seconds)
+    redis.expire(format(RUN_LOCK_KEY, session_id), seconds)
+  end
+
+  def release_run_lock!(session_id)
+    redis.del(format(RUN_LOCK_KEY, session_id))
+  end
+
+  def redis
+    @redis ||= Redis.new(url: ENV.fetch("REDIS_URL", "redis://localhost:6379/0"))
   end
 end