fix: use standard Navidrome variables to isolate DB on LiteFS and metadata on host volume

entrypoint.sh

@@ -84,8 +84,15 @@ start_app() {
   # Ensure shared directories exist on persistent host volume
   mkdir -p /data/plugins /data/cache /data/backup
 
-  # Tell Navidrome to use the database directly from the LiteFS mount.
-  export ND_DBPATH="/litefs/navidrome.db?cache=shared&_busy_timeout=15000&_journal_mode=WAL&_foreign_keys=on"
+  # Officially supported variables to split the database from the metadata
+  export ND_DATAFOLDER="/litefs"
+  export ND_CACHEFOLDER="/data/cache"
+  export ND_BACKUP_PATH="/data/backup"
+  export ND_PLUGINS_FOLDER="/data/plugins"
+
+  # We can still pass the SQLite optimization flags via ND_DBPATH 
+  # but we'll use a relative path so it respects ND_DATAFOLDER
+  export ND_DBPATH="navidrome.db?cache=shared&_busy_timeout=15000&_journal_mode=WAL&_foreign_keys=on"
 
   /app/navidrome &
   NAVIDROME_PID=$!