feat: hide event types from SAC UI via Settings checkbox (0.20.23)

Per-type «Показывать в событиях» in severity settings; filters lists, dashboard, hosts, and problems.

backend/app/models/__init__.py

@@ -1,4 +1,4 @@
-from app.models.agent_command import AgentCommand
+from app.models.agent_command import AgentCommand
 from app.models.api_key import ApiKey
 from app.models.event import Event
 from app.models.host import Host
@@ -9,6 +9,7 @@ from app.models.problem import Problem, ProblemEvent
 from app.models.login_attempt import LoginAttempt
 from app.models.ui_settings import UiSettings
 from app.models.event_severity_override import EventSeverityOverride
+from app.models.event_type_visibility import EventTypeVisibility
 from app.models.user import User
 from app.models.mobile_settings import MobileSettings
 from app.models.mobile_enrollment_code import MobileEnrollmentCode
@@ -27,6 +28,7 @@ __all__ = [
     "ProblemEvent",
     "User",
     "EventSeverityOverride",
+    "EventTypeVisibility",
     "LoginAttempt",
     "UiSettings",
     "MobileSettings",