feat: Add metadata support for peer discovery events

- Add metadata field to PeerDiscoveredEvent interface
- Add metadata field to PeerInfo interface
- Update event handler to forward metadata from native events
- Enables proper user identification in discovery

🤖 Generated with Claude Code
Co-Authored-By: Claude <noreply@anthropic.com>

implementations/Libp2pComponent.ts

@@ -135,13 +135,14 @@ export class Libp2pComponent implements ILibp2pComponent {
     // Peer discovery
     this.eventEmitter.addListener(
       'onPeerDiscovered',
-      ({ peerId, addresses, multiaddrs }: PeerDiscoveredEvent) => {
+      ({ peerId, addresses, multiaddrs, metadata }: PeerDiscoveredEvent) => {
         const addrs = (multiaddrs || addresses || []).map(
           (addr: string) => new SimpleMultiaddr(addr),
         );
         this.emit('peer:discovery', {
           id: new SimplePeerId(peerId),
           multiaddrs: addrs,
+          metadata: metadata, // Pass metadata through
         });
       },
     );