(plan) convert original implement plan to mock api

app/api/delivery/route.ts

@@ -0,0 +1,10 @@
+import { NextResponse } from 'next/server'
+import { apps, cluster, WAVES } from '@/lib/clusterMock'
+
+/** Mock stand-in for the real atlas `GET /api/delivery`. Serves fixture data, not a live Argo watch. */
+export async function GET() {
+  return NextResponse.json({
+    data: { apps, waves: WAVES },
+    meta: { snapshotAge: cluster.snapshotAge, generation: cluster.generation, truncated: false },
+  })
+}