Add role and peerId to pollOffers ICE candidate response types

- ICE candidates now include role ('offerer' | 'answerer')
- ICE candidates now include peerId for matching
- Enables clients to filter candidates by role
- Supports bidirectional ICE exchange

src/rondevu.ts

@@ -310,6 +310,8 @@ export class Rondevu {
         }>
         iceCandidates: Record<string, Array<{
             candidate: any
+            role: 'offerer' | 'answerer'
+            peerId: string
             createdAt: number
         }>>
     }> {