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/models/stream_session.rb

@@ -18,7 +18,7 @@ class StreamSession < ApplicationRecord
   before_validation :normalize_privacy_status
   before_validation :ensure_publish_token, on: :create
 
-  scope :broadcasting, -> { where(status: %w[live connecting reconnecting]) }
+  scope :broadcasting, -> { where(status: %w[live connecting reconnecting paused]) }
   scope :publicly_listed, -> { where(privacy_status: "public") }
   scope :search_by_team_or_opponent, lambda { |query|
     q = query.to_s.strip
@@ -95,18 +95,9 @@ class StreamSession < ApplicationRecord
   end
 
   def effective_hls_path_name
-    return mediamtx_path_name if terminal?
-    return mediamtx_overlay_path_name unless Streams::OverlayRelay.running?(id)
-    return mediamtx_overlay_path_name if overlay_air_has_output?
-
     mediamtx_path_name
   end
 
-  def overlay_air_has_output?
-    info = Mediamtx::Client.new.list_paths.find { |i| i["name"] == mediamtx_overlay_path_name }
-    info && (info["online"] || info["ready"] || info["available"])
-  end
-
   def watch_page_url
     "#{MatchLiveTv.app_public_url.chomp('/')}/live/#{id}"
   end