docs: refresh README; allow monitor JWT for RDG qwinsta/logoff (0.20.6)

Update platform docs for current features; Seaca and web operators with
monitor role can trigger WinRM actions via SAC API.

frontend/src/version.ts

@@ -1,4 +1,4 @@
 /** Fallback до загрузки /health; при релизе держите в sync с backend/app/version.py */
 export const APP_NAME = "Security Alert Center";
-export const APP_VERSION = "0.20.5";
+export const APP_VERSION = "0.20.6";
 export const APP_VERSION_LABEL = `${APP_NAME} v.${APP_VERSION}`;