Update db-backup-standalone.sh to use docker compose

- Replace docker service scale with docker compose stop/start
- Update service name from utility-bills-tracker_mongo to mongo
- Reference docker-compose-standalone.yaml compose file
- Update comments to reflect container operations vs swarm service

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

deploy-standalone.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+if [ "$1" == "" ] ; then
+    printf "\nNisi zadao verziju Docker image-a koji treba deployati"
+    printf "\n\nSintaksa:\n\n    deploy.sh 1.0.0\n\n"
+    exit 1
+fi
+
+printf "\nBUILD START ...\n\n"
+
+IMAGE_VERSION=$1
+
+echo "Deploying $STACK_NAME with image version: $IMAGE_VERSION"
+
+# Pass IMAGE_VERSION env var for compose variable substitution
+IMAGE_VERSION="$IMAGE_VERSION" docker compose up -d