feat: beta deploys all services with pipeline toggle defaulting to OFF

- pipelineEnabled: true in beta so all pods run (Kargo happy)
- PIPELINE_DEFAULT_OFF=true in beta config — scheduler initializes
  the Redis toggle to OFF on first boot
- Shared Ollama (10.1.1.12:2701) between beta and paper
- Flip pipeline ON from the UI when testing, OFF when done
- Optimistic UI update for the toggle button

frontend/src/api/hooks.ts

@@ -537,7 +537,13 @@ export function usePipelineToggle() {
   const qc = useQueryClient();
   return useMutation({
     mutationFn: (enabled: boolean) => apiPost<{ pipeline_enabled: boolean }>('query', '/api/ops/pipeline/toggle', { enabled }),
-    onSuccess: () => qc.invalidateQueries({ queryKey: ['pipeline-health'] }),
+    onMutate: async (enabled) => {
+      await qc.cancelQueries({ queryKey: ['pipeline-health'] });
+      qc.setQueriesData<Record<string, unknown>>({ queryKey: ['pipeline-health'] }, (old) =>
+        old ? { ...old, pipeline_enabled: enabled } : old,
+      );
+    },
+    onSettled: () => qc.invalidateQueries({ queryKey: ['pipeline-health'] }),
   });
 }