- Add @nestjs/throttler for rate limiting support
- Configure multiple throttle profiles: default (100/min), strict (10/min for spawn/kill), status (200/min for polling)
- Apply strict rate limits to spawn and kill endpoints to prevent DoS
- Apply higher rate limits to status/health endpoints for monitoring
- Add OrchestratorThrottlerGuard with X-Forwarded-For support for proxy setups
- Add unit tests for throttler guard
Refs #338
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>