Add backup functionality with escalation rules for moderation commands

- Updated .env.example to include backup configuration options.
- Modified docker-compose.yml to mount backup volume.
- Enhanced Dockerfile to install PostgreSQL client.
- Added EscalationRule model to Prisma schema for managing warning escalation.
- Updated environment validation in env.ts to include backup settings.
- Refactored job handling in jobs.ts to implement backup jobs and cleanup.
- Introduced escalation commands in moderation service for managing user warnings.
- Updated moderation commands to apply escalation rules based on warning count.

.env.example

@@ -9,3 +9,6 @@ DEFAULT_LOCALE=de
 METRICS_TOKEN=
 SENTRY_DSN=
 BACKUP_RETENTION_DAYS=14
+BACKUP_CRON=0 3 * * *
+BACKUP_DIR=/backups
+HEALTH_PORT=8080