Aggiunge overlay server-side burn-in e stabilizza diretta live.

Tabellone, badge e brand sono ricodificati nel flusso _air via OverlayRelay;
sync punteggio HTTP, volume condiviso rails/sidekiq, qualità 720p migliorata
e badge CONNECTING in ripresa da pausa.

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

scripts/test/rtmp_test_pattern.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+# Pubblica un pattern colorato su RTMP per testare il player web (senza telefono).
+# Uso:
+#   SESSION_ID=fe09a29f-79db-44d5-864f-397942c0a2c5 ./scripts/test/rtmp_test_pattern.sh
+#   RTMP_URL=rtmp://www.matchlivetv.it:1935/live/match_UUID ./scripts/test/rtmp_test_pattern.sh
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+OUT_DIR="${TMPDIR:-/tmp}/matchlivetv-test"
+PATTERN="$OUT_DIR/test_pattern.mp4"
+DURATION="${DURATION_SEC:-0}" # 0 = loop infinito
+
+if [[ -z "${RTMP_URL:-}" ]]; then
+  if [[ -z "${SESSION_ID:-}" ]]; then
+    echo "Imposta SESSION_ID o RTMP_URL"
+    exit 1
+  fi
+  RTMP_URL="rtmp://www.matchlivetv.it:1935/live/match_${SESSION_ID}"
+fi
+
+mkdir -p "$OUT_DIR"
+
+if [[ ! -f "$PATTERN" ]]; then
+  echo "Genero video di test $PATTERN ..."
+  ffmpeg -y -hide_banner -loglevel warning \
+    -f lavfi -i "testsrc2=size=1280x720:rate=30" \
+    -f lavfi -i "sine=frequency=880:sample_rate=48000" \
+    -t 30 \
+    -c:v libx264 -pix_fmt yuv420p -profile:v baseline -level 3.1 -g 30 -keyint_min 30 \
+    -c:a aac -b:a 128k -ac 1 \
+    "$PATTERN"
+fi
+
+echo "Pubblico su $RTMP_URL (Ctrl+C per fermare)"
+ARGS=(-re -stream_loop -1 -i "$PATTERN" -c copy -f flv "$RTMP_URL")
+if [[ "$DURATION" != "0" ]]; then
+  ARGS=(-re -t "$DURATION" -i "$PATTERN" -c copy -f flv "$RTMP_URL")
+fi
+
+exec ffmpeg -hide_banner "${ARGS[@]}"