feat: SAC 0.7.0 display_name columns and event severity overrides

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

backend/app/services/event_summary.py

@@ -0,0 +1,20 @@
+from app.models.event import Event
+from app.schemas.list_models import EventSummary
+
+
+def event_to_summary(event: Event) -> EventSummary:
+    host = event.host
+    return EventSummary(
+        id=event.id,
+        event_id=event.event_id,
+        host_id=event.host_id,
+        hostname=host.hostname,
+        display_name=host.display_name,
+        occurred_at=event.occurred_at,
+        received_at=event.received_at,
+        category=event.category,
+        type=event.type,
+        severity=event.severity,
+        title=event.title,
+        summary=event.summary,
+    )