- Plugin admin UI: enable/disable per plugin with config forms - Event hooks system: HookManager with on/off/emit for plugin events - Database notifications: persistent via WebsiteNotification table + Redis pub/sub - Notification preferences: per-user settings with API endpoints - Web Push API: browser push notification subscription - Webhook retry: 3 attempts with exponential backoff (1s/3s/9s) + delivery logs - Webhook test button + paginated delivery log viewer - Games: rank/challenge/reward admin pages - Games: public frontend leaderboard - Rate limiting: search API (30/min), notification stream dedup - Unit tests: 28 new tests (registry, notifications, webhooks) - Prisma migration 0017: website_notifications, website_notification_preferences, website_webhook_logs
