feat(automations): add event trigger match and inputs

surfsense_backend/app/automations/triggers/builtin/event/inputs.py

@@ -0,0 +1,17 @@
+"""Build run inputs from a published event."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from app.event_bus import Event
+
+
+def event_runtime_inputs(event: Event) -> dict[str, Any]:
+    """Flatten the event payload and stamp event metadata as run inputs."""
+    return {
+        **event.payload,
+        "event_type": event.event_type,
+        "event_id": event.event_id,
+        "occurred_at": event.occurred_at.isoformat(),
+    }