fix: event terminate-session 500 on rdp.login.success (0.3.7)

Use extract_event_actor_user instead of missing ORM field; map WinRM/SSH errors to HTTP 400.

Co-authored-by: Cursor <cursoragent@cursor.com>

README_en.md

@@ -13,7 +13,7 @@ Self-hosted hub for security events from Linux and Windows agents: ingest, corre
 | **security-alert-center** | SAC server (Ubuntu 24.04) |
 | [seaca](https://git.kalinamall.ru/PapaTramp/seaca) | Android client |
 
-**Version:** `0.3.6` · **Deploy:** `sudo /opt/sac-deploy.sh`
+**Version:** `0.3.7` · **Deploy:** `sudo /opt/sac-deploy.sh`
 
 ## Features