Integrate login session API endpoints with service layer #9711
Description
Wire up REST and GraphQL endpoints to the actual service/repository implementations. Replace NotImplementedError stubs with real service calls.
Scope
- Connect REST handlers to LoginSessionService methods
- Connect GraphQL resolvers to LoginSessionService methods
- Admin user create/update: include login_security_policy field pass-through
- End-to-end functional verification
Dependencies
- Blocked by Story 1 (DB + Service layer) and Story 2 (API layer)
JIRA Issue: BA-4907