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>

utils/types.ts

@@ -32,6 +32,12 @@ export interface PeerDiscoveredEvent {
   peerId: string;
   addresses?: string[];
   multiaddrs?: string[];
+  metadata?: {
+    userId?: string;
+    deviceName?: string;
+    source?: string;
+    [key: string]: any;
+  };
 }
 
 export interface PeerLostEvent {