feat: add federatedCallId and callOrigin to client call routing

Enable federated DM calls to route accept/reject/end through the correct
WebSocket connection using callOrigin, and include federatedCallId in all
dm_call payloads for server-side FederatedCallEntry lookup.

packages/web/src/utils/voiceActions.ts

@@ -88,9 +88,10 @@ export function handleDisconnectAction(): void {
   const { activeDmCall, currentVoiceChannelId, disconnectFn } = voice;
 
   if (activeDmCall) {
+    const origin = voice.callOrigin || getChannelOrigin(activeDmCall.dmChannelId);
     wsSend(
-      { type: 'dm_call_end', dmChannelId: activeDmCall.dmChannelId },
-      getChannelOrigin(activeDmCall.dmChannelId)
+      { type: 'dm_call_end', dmChannelId: activeDmCall.dmChannelId, federatedCallId: voice.federatedCallId },
+      origin
     );
     voice.setActiveDmCall(null);
   } else if (currentVoiceChannelId) {