音视频通话功能完成（P2P）

已知问题：
文件无法发送

src/api/websocket/index.ts

@@ -48,20 +48,46 @@ class WebSocketManager {
 
         this.ws.onmessage = (event) => {
           try {
-            const payload: WebSocketMessage = JSON.parse(event.data)
+            // 处理可能的多行JSON或消息分割
+            const data = event.data.toString().trim()
             
-            // 接收clientId
-            if (payload.clientId) {
-              this.clientId = payload.clientId
-              console.log('Received clientId:', this.clientId)
-            }
+            // 尝试按行分割处理多个JSON对象
+            const lines = data.split('\n').filter(line => line.trim())
             
-            // 处理接收消息
-            if (payload.request_type === 'receive_message' && payload.data) {
-              this.handleMessage(payload.data)
+            for (const line of lines) {
+              try {
+                const payload: WebSocketMessage = JSON.parse(line)
+                
+                // 接收clientId
+                if (payload.clientId) {
+                  this.clientId = payload.clientId
+                  console.log('Received clientId:', this.clientId)
+                }
+                
+                // 处理接收消息
+                if (payload.request_type === 'receive_message' && payload.data) {
+                  this.handleMessage(payload.data)
+                }
+              } catch (lineError) {
+                // 如果单行解析失败，尝试解析整个数据
+                if (lines.length === 1) {
+                  const payload: WebSocketMessage = JSON.parse(data)
+                  
+                  if (payload.clientId) {
+                    this.clientId = payload.clientId
+                    console.log('Received clientId:', this.clientId)
+                  }
+                  
+                  if (payload.request_type === 'receive_message' && payload.data) {
+                    this.handleMessage(payload.data)
+                  }
+                } else {
+                  console.warn('Failed to parse WebSocket message line:', line, lineError)
+                }
+              }
             }
           } catch (error) {
-            console.error('WebSocket message parse error:', error)
+            console.error('WebSocket message parse error:', error, 'Data:', event.data)
           }
         }
 
@@ -140,13 +166,15 @@ class WebSocketManager {
    * 处理接收到的消息
    */
   private handleMessage(message: ChatMessage) {
-    // 信令消息（message_type = 6）
+    // 信令消息（message_type = 6）- 路由到signalHandlers，不路由到messageHandlers
     if (message.message_type === 6) {
+      console.log('[WebSocket] Routing signaling message:', message.call_status, message.call_id)
       this.signalHandlers.forEach(handler => handler(message))
-    } else {
-      // 普通消息
-      this.messageHandlers.forEach(handler => handler(message))
+      return // 重要：信令消息不进入普通消息处理流程
     }
+    
+    // 普通消息 - 路由到messageHandlers
+    this.messageHandlers.forEach(handler => handler(message))
   }
 
   /**