Aggiunge replay YouTube temporaneo, pull registrazioni dai CPX e snapshot ingest in admin.

Così overflow Hetzner e VOD YouTube restano in archivio dopo lo spegnimento del nodo, e la colonna ingest non si svuota.

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

backend/app/models/stream_session.rb

@@ -1,7 +1,8 @@
 class StreamSession < ApplicationRecord
   include AASM
 
-  PLATFORMS = %w[matchlivetv youtube facebook twitch].freeze
+  LIVE_PLATFORMS = %w[matchlivetv youtube].freeze
+  PLATFORMS = (LIVE_PLATFORMS + %w[facebook twitch]).freeze
   STATUSES = %w[idle connecting live reconnecting paused ended error].freeze
   PRIVACY_STATUSES = %w[public unlisted private].freeze
 
@@ -20,6 +21,7 @@ class StreamSession < ApplicationRecord
 
   before_validation :normalize_privacy_status
   before_validation :ensure_publish_token, on: :create
+  before_validation :snapshot_ingest_from_node, if: -> { stream_node.present? }
 
   scope :broadcasting, -> { where(status: %w[live connecting reconnecting paused]) }
   scope :publicly_listed, -> { where(privacy_status: "public") }
@@ -74,6 +76,14 @@ class StreamSession < ApplicationRecord
     end
   end
 
+  def ingest_slug_display
+    stream_node&.slug.presence || ingest_slug
+  end
+
+  def ingest_role_display
+    stream_node&.role.presence || ingest_role
+  end
+
   def rtmp_ingest_url
     # RootEncoder richiede rtmp://host:port/app/stream (due segmenti).
     # MediaMTX path = live/match_{uuid} (no ?token= nel path).
@@ -208,6 +218,11 @@ class StreamSession < ApplicationRecord
     self.privacy_status = "unlisted" if privacy_status == "private"
   end
 
+  def snapshot_ingest_from_node
+    self.ingest_slug = stream_node.slug
+    self.ingest_role = stream_node.role
+  end
+
   def record_ended_timestamps!
     now = Time.current
     update!(ended_at: now) if ended_at.nil?