feat: bundle demo media and playlist in playout image for out-of-the-box HLS

backend/playout/Dockerfile

@@ -28,6 +28,10 @@ RUN chmod +x /app/*.sh /app/playlist-manager
 # Create directories for playlist, media, and HLS output
 RUN mkdir -p /app/playlist /app/media /app/hls
 
+# Copy demo media and playlist for out-of-the-box playout
+COPY media/ /app/media/
+COPY media/playlist.txt /app/playlist/playlist.txt
+
 # Expose HLS directory (will be served by nginx)
 VOLUME ["/app/hls"]