feat(database): add migration and sync-db scripts to deployment process

- Introduced a new npm script for database migrations in package.json.
- Updated update-backend.sh to execute migrations and conditionally run legacy sync-db based on environment variable.
- Enhanced syncDatabase.js to skip initialization routines if APP_INIT_ON_START is not set, promoting best practices for schema changes during deployment.

backend/package.json

@@ -9,6 +9,7 @@
     "dev": "NODE_ENV=development node server.js",
     "start-daemon": "node daemonServer.js",
     "sync-db": "node sync-database.js",
+    "db:migrate": "sequelize-cli db:migrate --config config/sequelize-cli.cjs --migrations-path migrations --env production",
     "sync-tables": "node sync-tables-only.js",
     "check-connections": "node check-connections.js",
     "cleanup-connections": "node cleanup-connections.js",