feat(events): add EventDeleteView for permanent event deletion

- Add EventDeleteView with DELETE /api/v1/events/<pk>/delete/
- Register delete URL in admin_api/urls.py

admin_api/views.py

@@ -861,6 +861,17 @@ class EventModerationView(APIView):
         return Response(_serialize_event(e))
 
 
+class EventDeleteView(APIView):
+    permission_classes = [IsAuthenticated]
+
+    def delete(self, request, pk):
+        from events.models import Event
+        from django.shortcuts import get_object_or_404
+        e = get_object_or_404(Event, pk=pk)
+        e.delete()
+        return Response({'status': 'deleted'}, status=204)
+
+
 # ---------------------------------------------------------------------------
 # Phase 6: Financials & Payouts
 # ---------------------------------------------------------------------------