make seed phrase optional

src/lib/neynar.ts

@@ -0,0 +1,18 @@
+import { NeynarAPIClient } from '@neynar/nodejs-sdk';
+
+let neynarClient: NeynarAPIClient | null = null;
+
+export function getNeynarClient() {
+  if (!neynarClient) {
+    const apiKey = process.env.NEYNAR_API_KEY;
+    if (!apiKey) {
+      throw new Error('NEYNAR_API_KEY not configured');
+    }
+    neynarClient = new NeynarAPIClient(apiKey);
+  }
+  return neynarClient;
+}
+
+// Example usage:
+// const client = getNeynarClient();
+// const user = await client.lookupUserByFid(fid);