chore: import upstream snapshot with attribution

apps/webapp/app/routes/admin.api.v1.llm-models.missing.ts

@@ -0,0 +1,18 @@
+import { type LoaderFunctionArgs, json } from "@remix-run/server-runtime";
+import { requireAdminApiRequest } from "~/services/personalAccessToken.server";
+import { getMissingLlmModels } from "~/services/admin/missingLlmModels.server";
+
+export async function loader({ request }: LoaderFunctionArgs) {
+  await requireAdminApiRequest(request);
+
+  const url = new URL(request.url);
+  const lookbackHours = parseInt(url.searchParams.get("lookbackHours") ?? "24", 10);
+
+  if (isNaN(lookbackHours) || lookbackHours < 1 || lookbackHours > 720) {
+    return json({ error: "lookbackHours must be between 1 and 720" }, { status: 400 });
+  }
+
+  const models = await getMissingLlmModels({ lookbackHours });
+
+  return json({ models, lookbackHours });
+}