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.

packages/shared/src/i18n.test.ts

@@ -0,0 +1,8 @@
+import { describe, expect, it } from 'vitest';
+import { t } from './index.js';
+
+describe('i18n helper', () => {
+  it('returns german translations', () => {
+    expect(t('de', 'moderation.success')).toBe('Aktion erfolgreich ausgeführt.');
+  });
+});