feat: Add Portracker service with Synology setup guides and scripts

portracker/create_portracker_folders.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+# Define base path
+BASE="/volume1/docker/portracker"
+
+# Create folders
+mkdir -p "${BASE}/data"
+
+# Set ownership and permissions
+# IMPORTANT: Replace 1024:100 with your actual PUID:PGID if necessary
+# By default, we initialize it and you can adjust via Synology File Station if needed.
+chown -R 1024:100 "${BASE}"
+chmod -R 750 "${BASE}"
+
+echo "Folders created and permissions set for ${BASE}"