fix: Fixes to running on kubernetes

web/app/healthz/route.ts

@@ -0,0 +1,15 @@
+import { NextResponse } from "next/server";
+
+// Liveness and readiness for the Next server itself. Deliberately at /healthz
+// and not /api/healthz: next.config.ts rewrites the whole of /api to the Go
+// server, so a probe there would report the backend's health instead of this
+// process's — and would keep passing while this pod was wedged.
+//
+// It answers without touching the backend on purpose. web is stateless; a
+// backend outage must not take every web replica out of its Service as well,
+// which would turn one failure into two.
+export const dynamic = "force-dynamic";
+
+export function GET() {
+    return NextResponse.json({ status: "ok" });
+}