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/main.py

@@ -39,6 +39,7 @@ from app.routers import advanced_metrics as advanced_metrics_router
 from app.routers import osint as osint_router
 from app.routers import webhooks as webhooks_router
 from app.routers import detection_lifecycle as detection_lifecycle_router
+from app.routers import ownership as ownership_router
 from app.domain.errors import DomainError
 from app.middleware.error_handler import domain_exception_handler
 from app.middleware.request_context import RequestContextMiddleware
@@ -137,6 +138,7 @@ app.include_router(advanced_metrics_router.router, prefix="/api/v1")
 app.include_router(osint_router.router, prefix="/api/v1")
 app.include_router(webhooks_router.router, prefix="/api/v1")
 app.include_router(detection_lifecycle_router.router, prefix="/api/v1")
+app.include_router(ownership_router.router, prefix="/api/v1")
 
 
 @app.get("/health", include_in_schema=False)