move demo-data to its own folder

backend/playout/Dockerfile

@@ -29,8 +29,8 @@ RUN chmod +x /app/*.sh /app/playlist-manager
 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
+COPY demo-data/media/ /app/media/
+COPY demo-data/playlist/playlist.txt /app/playlist/playlist.txt
 
 # Expose HLS directory (will be served by nginx)
 VOLUME ["/app/hls"]