feat(backup): add enterprise backup & restore foundation

frontend/athena/app/api/backups/[filename]/download/route.ts

@@ -0,0 +1,14 @@
+import { NextRequest } from "next/server";
+
+import { proxyHermesStreamRequest } from "@/lib/server/hermes-proxy";
+
+type Params = {
+  params: Promise<{
+    filename: string;
+  }>;
+};
+
+export async function GET(request: NextRequest, context: Params) {
+  const { filename } = await context.params;
+  return proxyHermesStreamRequest(request, `/backups/${encodeURIComponent(filename)}/download`);
+}