feat(entrypoint): Ensure shared directories exist and clean up start_app

entrypoint.sh

@@ -48,10 +48,8 @@ deregister_service() {
 start_app() {
   echo "Node is Primary. Starting Navidrome..."
   
-  # Ensure DB path and local data folder are set
-  export ND_DATABASE_PATH="/data/navidrome.db"
-  export ND_DATAFOLDER="/local/data"
-  mkdir -p /local/data
+  # Ensure shared directories exist
+  mkdir -p /shared_data/plugins /shared_data/cache /shared_data/backup
 
   /app/navidrome &
   NAVIDROME_PID=$!
@@ -121,4 +119,4 @@ while true; do
   # Sleep short enough to update TTL (every 5s is safe for 15s TTL)
   sleep 5 &
   wait $! # Wait allows the 'trap' to interrupt the sleep instantly
-done
+done