chore(deploy): leave database backups to external tools

The app no longer dumps Postgres, restores it, or checks copies in CI.

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/compose.yaml

@@ -145,26 +145,6 @@ services:
       interval: 5s
       retries: 20
 
-  # Ежедневная копия базы и еженедельная проверка восстановления (deploy/backup.sh, docs/deployment.md#бэкапы).
-  backup:
-    <<: *restart
-    image: pgvector/pgvector:0.8.7-pg17
-    entrypoint: ["bash", "/backup.sh"]
-    command: ["loop"]
-    environment:
-      PGHOST: postgres
-      PGUSER: pipu
-      PGPASSWORD: ${POSTGRES_PASSWORD}
-      PGDATABASE: pipu
-      BACKUP_HOUR: ${BACKUP_HOUR:-3}
-      BACKUP_KEEP_DAILY: ${BACKUP_KEEP_DAILY:-14}
-      BACKUP_KEEP_WEEKLY: ${BACKUP_KEEP_WEEKLY:-8}
-    volumes:
-      - ./backup.sh:/backup.sh:ro
-      - ${PIPU_DATA:-/srv/pipu}/backups:/backups
-    depends_on:
-      postgres: { condition: service_healthy }
-
   redis:
     <<: *restart
     image: redis:7.4-alpine