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.

apps/bot/Dockerfile

@@ -17,6 +17,7 @@ RUN pnpm --filter @nexumi/bot build
 FROM node:22-alpine AS runner
 WORKDIR /app
 RUN corepack enable
+RUN apk add --no-cache postgresql16-client
 COPY --from=build /app/node_modules ./node_modules
 COPY --from=build /app/apps/bot/dist ./apps/bot/dist
 COPY --from=build /app/apps/bot/prisma ./apps/bot/prisma