feat(backend): 6 модулей для main/роутов + ws_notifications
- api/helpers: audit, is_authority, get_org_name, paginate_query, require_roles
- services/ws_manager: connect(ws, user_id, org_id), send_to_user, send_to_org, broadcast, make_notification(event, entity_type, entity_id, **extra)
- services/risk_scheduler: setup_scheduler (заглушка/APScheduler)
- services/email_service: email_service.send (заглушка)
- middleware/request_logger: RequestLoggerMiddleware
- core/rate_limit: RateLimitMiddleware (in-memory, RATE_LIMIT_PER_MINUTE, /health в обход)
- api/routes/ws_notifications: WebSocket /ws/notifications?user_id=&org_id=
Co-authored-by: Cursor <cursoragent@cursor.com>
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