feat(intel): major intel scan improvements + Review Queue integration

Backend:
- intel_service: remove 50-technique limit (scan all techniques), improve
  pattern matching with word boundaries (\bT1059\b), raise min name length
  to 8 chars to reduce false positives, skip entries with empty titles
- technique_query_service: add intel_items to get_technique_detail() so
  the technique page now shows recent threat intel articles (last 20)
- New GET /intel/items endpoint with optional technique_id filter

Frontend:
- New api/intel.ts with listIntelItems()
- ReviewQueuePage: complete redesign
    * Expandable rows — click a technique to see its intel articles inline
    * IntelPanel component fetches articles per technique on expand
    * 'Create Template from Intel' button opens pre-filled modal:
      name (from article title), source_url (article link), technique_id
      User reads the article and fills the attack procedure
    * Updated explanation text: lists all 3 reasons a technique can be flagged
      (MITRE update / intel scan / new template or detection rule)

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 intel as intel_router
 from app.routers import ownership as ownership_router
 from app.routers import attack_paths as attack_paths_router
 from app.routers import knowledge as knowledge_router
@@ -145,6 +146,7 @@ app.include_router(heatmap_router.router, prefix="/api/v1")
 app.include_router(scores_router.router, prefix="/api/v1")
 app.include_router(operational_metrics_router.router, prefix="/api/v1")
 app.include_router(compliance_router.router, prefix="/api/v1")
+app.include_router(intel_router.router, prefix="/api/v1")
 app.include_router(snapshots_router.router, prefix="/api/v1")
 app.include_router(jira_router.router, prefix="/api/v1")
 app.include_router(worklogs_router.router, prefix="/api/v1")