feat(risk): Phase 12 — Risk Intelligence [FASE-12]

- TechniqueRiskProfile model: per-technique risk scoring (0-100)
- 4-factor weighted scoring: detection_gap(35%) + threat_actors(30%) + osint(20%) + test_failures(15%)
- Risk levels: critical(≥75) / high(≥50) / medium(≥25) / low(≥10) / info
- Detailed scoring_breakdown (JSONB) + actionable recommendations per technique
- Router /api/v1/risk: compute-all, compute-one, list, matrix, summary, recommendations, top
- Alembic migration b038risk (raw SQL, idempotent)
- QA script: 60+ tests across all endpoints

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

backend/app/main.py

@@ -42,6 +42,7 @@ from app.routers import detection_lifecycle as detection_lifecycle_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
+from app.routers import risk_intelligence as risk_router
 from app.domain.errors import DomainError
 from app.middleware.error_handler import domain_exception_handler
 from app.middleware.request_context import RequestContextMiddleware
@@ -143,6 +144,7 @@ app.include_router(detection_lifecycle_router.router, prefix="/api/v1")
 app.include_router(ownership_router.router, prefix="/api/v1")
 app.include_router(attack_paths_router.router, prefix="/api/v1")
 app.include_router(knowledge_router.router, prefix="/api/v1")
+app.include_router(risk_router.router, prefix="/api/v1")
 
 
 @app.get("/health", include_in_schema=False)