Add developer API, Prometheus metrics, and community links

app/api/dev/openapi.json/route.ts

@@ -0,0 +1,10 @@
+import { developerOpenApi } from "@/shared/developer-openapi";
+export const dynamic = "force-static";
+export function GET() {
+  return Response.json(developerOpenApi, {
+    headers: {
+      "Cache-Control": "public, max-age=3600",
+      "X-Content-Type-Options": "nosniff",
+    },
+  });
+}