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>

scripts/build_mobile_apk_prod.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+# APK release per telefono → API produzione
+set -euo pipefail
+export PATH="${HOME}/flutter/bin:${PATH}"
+
+API_BASE_URL="${API_BASE_URL:-https://www.matchlivetv.it}"
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+
+cd "$ROOT/mobile"
+flutter pub get
+flutter build apk --release \
+  --dart-define="API_BASE_URL=${API_BASE_URL}"
+
+echo "APK: mobile/build/app/outputs/flutter-apk/app-release.apk"
+echo "API_BASE_URL=${API_BASE_URL}"