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.

README.md

@@ -0,0 +1,43 @@
+# Nexumi
+
+Nexumi is a self-hosted public Discord bot with dashboard architecture, built as a TypeScript monorepo.
+
+## Phase 1 scope
+
+- Monorepo foundation with `apps/bot` and `packages/shared`
+- PostgreSQL + Redis compose stack
+- Prisma core schema (`Guild`, `GuildSettings`, `User`, `Case`) plus moderation tables (`Warning`, `ModNote`)
+- Command and module framework for slash command routing
+- Permission layer and i18n starter (`de` + `en`)
+- BullMQ integration for persistent moderation jobs (temp-ban expiration)
+- Complete moderation reference command set for Phase 1
+
+## Quickstart
+
+1. Copy `.env.example` to `.env` and fill required values.
+2. Install dependencies:
+   - `pnpm install`
+3. Generate Prisma client:
+   - `pnpm prisma:generate`
+4. Start stack:
+   - `docker compose up -d`
+5. Start bot locally:
+   - `pnpm --filter @nexumi/bot dev`
+
+## Verification commands
+
+- `pnpm typecheck`
+- `pnpm lint`
+- `pnpm test`
+
+## Backup and restore note
+
+Phase 1 includes the BullMQ foundation for scheduled jobs. Database backup rotation is configured via `BACKUP_RETENTION_DAYS` and the `backups` volume is already reserved in compose.
+
+Restore flow (manual, PostgreSQL container):
+
+1. Stop bot/web services.
+2. Copy dump into postgres container.
+3. Run `psql` restore against `nexumi` database:
+   - `docker compose exec -T postgres psql -U nexumi -d nexumi < /path/to/backup.sql`
+4. Start services again.