fix: Fix users unable to see or hear each other in voice channels due to

stale server sockets, passive non-initiators, and race conditions
during peer connection setup.

Fix users unable to see or hear each other in voice channels due to
stale server sockets, passive non-initiators, and race conditions
during peer connection setup.

Server:
- Close stale WebSocket connections sharing the same oderId in
  handleIdentify instead of letting them linger up to 45s
- Make user_joined/user_left broadcasts identity-aware so duplicate
  sockets don't produce phantom join/leave events
- Include serverIds in user_left payload for multi-room presence
- Simplify findUserByOderId now that stale sockets are cleaned up

Client - signaling:
- Add fallback offer system with 1s timer for missed user_joined races
- Add non-initiator takeover after 5s when the initiator fails to send
  an offer (NON_INITIATOR_GIVE_UP_MS)
- Scope peerServerMap per signaling URL to prevent cross-server
  collisions
- Add socket identity guards on all signaling event handlers
- Replace canReusePeerConnection with hasActivePeerConnection and
  isPeerConnectionNegotiating with extended grace periods

Client - peer connections:
- Extract replaceUnusablePeer helper to deduplicate stale peer
  replacement in offer and ICE handlers
- Add stale connectionstatechange guard to ignore events from replaced
  RTCPeerConnection instances
- Use deterministic initiator election in peer recovery reconnects
- Track createdAt on PeerData for staleness detection

Client - presence:
- Add multi-room presence tracking via presenceServerIds on User
- Replace clearUsers + individual userJoined with syncServerPresence
  for atomic server roster updates
- Make userLeft handle partial server removal instead of full eviction

Documentation:
- Add server-side connection hygiene, non-initiator takeover, and stale
  peer replacement sections to the realtime README

toju-app/src/app/infrastructure/realtime/realtime-session.service.ts

@@ -176,6 +176,7 @@ export class WebRTCService implements OnDestroy {
     });
 
     this.signalingMessageHandler = new IncomingSignalingMessageHandler({
+      getLocalOderId: () => this.signalingTransportHandler.getIdentifyCredentials()?.oderId ?? null,
       getEffectiveServerId: () => this.voiceSessionController.getEffectiveServerId(this.state.currentServerId),
       peerManager: this.peerManager,
       setServerTime: (serverTime) => this.timeSync.setFromServerTime(serverTime),
@@ -229,7 +230,6 @@ export class WebRTCService implements OnDestroy {
 
     this.peerManager.peerDisconnected$.subscribe((peerId) => {
       this.remoteScreenShareRequestController.handlePeerDisconnected(peerId);
-      this.signalingCoordinator.deletePeerTracking(peerId);
     });
 
     // Media manager → voice connected signal