feat(ownership): Phase 9 — Ownership & Daily Operations [FASE-9]

Backend:
- TechniqueOwnership model: per-technique owner, backup owner, team
- RevalidationQueueItem model: prioritised analyst work queue
  (critical/high/medium/low, reasons: validation_expired/infra_change/
   osint_alert/mitre_update/rule_modified/low_confidence/manual)
- Migration b035ownerq: creates technique_ownerships and
  revalidation_queue_items tables with full indexes

Services:
- ownership_service: set/get technique ownership, bulk assign by tactic
  or platform, orphan reports for techniques and assets
- revalidation_queue_service: smart queue generation (scans expired
  validations, low-confidence techniques, recent infra changes),
  list/create/update queue items, analyst dashboard

Router /api/v1/ownership:
  GET/PUT /ownership/techniques/{id}   — technique ownership
  PATCH   /ownership/assets/{id}       — asset ownership
  GET     /ownership/orphans/techniques — orphan report
  GET     /ownership/orphans/assets     — orphan report
  POST    /ownership/bulk-assign        — bulk by tactic/platform
  GET/POST /ownership/queue             — revalidation queue CRUD
  PATCH   /ownership/queue/{id}         — update item status/assignee
  POST    /ownership/queue/generate     — scan & generate items
  GET     /ownership/analyst-dashboard  — personalised daily view

Scheduler: queue_generation job daily at 02:30 (after decay engine)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/models/__init__.py

@@ -29,6 +29,10 @@ from app.models.detection_lifecycle import (
     DetectionConfidence, DetectionHealthStatus, InvalidationReason,
 )
 from app.models.decay_policy import DecayPolicy
+from app.models.ownership_queue import (
+    TechniqueOwnership, RevalidationQueueItem,
+    QueuePriority, QueueStatus, QueueReason,
+)
 
 __all__ = [
     "User", "Technique", "Test", "TestTemplate", "Evidence",
@@ -45,4 +49,6 @@ __all__ = [
     "WebhookConfig", "SystemConfig",
     "DetectionAsset", "DetectionTechniqueMapping", "DetectionValidation",
     "TechniqueConfidenceScore", "InfrastructureChangeLog", "DecayPolicy",
+    "TechniqueOwnership", "RevalidationQueueItem",
+    "QueuePriority", "QueueStatus", "QueueReason",
 ]