feat: implement background job system with queue, worker, scheduler, and handlers
- Add job queue abstraction (InMemoryQueue and Redis/BullMQ adapter)
- Add polling worker with retry logic and exponential backoff
- Add 6 job handlers: darkwatch.scan, voiceprint.batch, hometitle.scan,
removebrokers.process, reports.generate, notifications.send
- Add cron-based scheduler with tier-appropriate frequencies
(Basic/Plus/Premium)
- Add tRPC scheduler router for admin (runJobNow, getJobStatus, etc.)
- Add entry point with graceful shutdown support
- Achieve 100% test pass rate for new job system
Michael Freno
eb8e57c674