Add developer API, Prometheus metrics, and community links

app/api/metrics/route.ts

@@ -0,0 +1,16 @@
+import { admin, required } from "@/lib/supabase";
+import { metricsResponse } from "@/lib/prometheus-response";
+
+export const runtime = "nodejs";
+export const dynamic = "force-dynamic";
+export const maxDuration = 30;
+export function GET(request: Request) {
+  return metricsResponse(request, async (tokenHash) => {
+    const result = await admin().rpc("read_prometheus_metrics", {
+      p_token_hash: tokenHash,
+    });
+    // NULL is an invalid or disabled credential, not a missing database record.
+    if (result.error) required(result);
+    return result.data;
+  });
+}