Refactor deployment scripts to separate standalone and swarm modes

- Remove ambiguous docker-compose-deploy.yml and debug-deploy.sh
- Update deploy-standalone.sh to use docker-compose-standalone.yaml
- Update deploy-swarm.sh to use docker-compose-swarm.yml
- Standardize error messages to English in deployment scripts
- Add db-backup-swarm.sh for swarm-specific backups
- Unify network naming to util-bills-mongo-network across configs
- Fix MongoDB credentials in swarm compose file

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

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

deploy-swarm.sh

@@ -1,17 +1,18 @@
 #!/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"
+    printf "\nDocker image-a version param missing"
+    printf "\n\nSyntax:\n\n    deploy-swarm.sh 1.0.0\n\n"
     exit 1
 fi
 
 printf "\nBUILD START ...\n\n"
 
 IMAGE_VERSION=$1
+COMPOSE_FILE="docker-compose-swarm.yml"
 
-echo "Deploying $STACK_NAME with image version: $IMAGE_VERSION"
+echo "Deploying with image version: $IMAGE_VERSION"
 
 # Pass IMAGE_VERSION env var for compose variable substitution
 IMAGE_VERSION="$IMAGE_VERSION" docker stack deploy \
-    -c docker-compose-deploy.yml \
+    -c "$COMPOSE_FILE" \
     utility-bills-tracker