【m】解决远端黑屏问题

src/class/websockethandler.ts

@@ -239,7 +239,8 @@ function onOffer(ws: WebSocket, message: any): void {
         }
       } else {
         // participant发送offer给host，携带该participant的participantId
-        newOffer.polite = true;
+        // host端应为impolite（polite=false），确保perfect negotiation中host优先
+        newOffer.polite = false;
         group.host.send(JSON.stringify({ from: connectionId, to: "", type: "offer", data: newOffer, participantId: senderParticipantId }));
       }
     }