feat: Complete VS-02 BE + ASYNC - REST API + Hangfire (Batch 1 - 5/7)
Implements backend and async components:
✅ BE (REST API):
- POST /api/security/master/sync (idempotent, version-based)
- GET /api/security/master/rules (cached, staleness check)
- SyncHandler: Conflict resolution, atomic persistence
- Abstractions: IRemoteSecurityMasterClient, ISecurityMasterRulesStore
✅ ASYNC (Events + Hangfire):
- SecurityMasterSyncedEvent: Notifies when sync completes
- PermissionRuleUpdatedEvent: Per-rule change notification
- SecurityMasterSyncJob: Periodic sync via Hangfire (30s interval)
- CacheInvalidationConsumer: Inbox handler (idempotent)
AGENTS.md v16.0 compliance:
✅ Necessity: WBS VS-02 BE/ASYNC phases
✅ Simplicity: Focused handlers, no unnecessary abstractions
✅ Idempotency: Version-based + idempotency keys
✅ Transactional: Atomic database updates
✅ Event-driven: Outbox/Inbox async coupling
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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