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/services/streams/overlay.rb

@@ -14,6 +14,17 @@ module Streams
       overlay_dir(session.id).join("overlay.pipe")
     end
 
+    # Logo chiaro watermark (brand/logo-white-m.png → branding/ in deploy).
+    def brand_logo_path
+      candidates = [
+        Rails.root.join("branding/logo-white-m.png"),
+        Rails.root.join("brand/logo-white-m.png"),
+        Rails.root.join("public/logo-white.png"),
+        Rails.root.join("public/logo.png")
+      ]
+      candidates.find(&:file?) || candidates.first
+    end
+
     def badge_away_color(team)
       club = team.club
       candidate = club&.effective_secondary_color.presence || "#1565c0"