fix: 修复停止录音后未等待豆包返回最终结果，导致历史记录和自动粘贴失效

internal/asr/client.go

@@ -111,6 +111,7 @@ func (c *Client) SendAudio(pcm []byte, last bool) error {
 // readLoop reads server responses and forwards them to resultCh.
 func (c *Client) readLoop(resultCh chan<- wsMsg.ServerMsg) {
 	defer func() {
+		c.conn.Close()
 		c.mu.Lock()
 		c.closed = true
 		c.mu.Unlock()
@@ -153,13 +154,26 @@ func (c *Client) readLoop(resultCh chan<- wsMsg.ServerMsg) {
 		}
 	}
 }
-// Close shuts down the ASR connection.
-func (c *Client) Close() {
+// Finish sends the last audio frame and waits for ASR to return final results.
+func (c *Client) Finish() {
 	c.mu.Lock()
-	if !c.closed {
-		c.conn.Close()
+	if c.closed {
+		c.mu.Unlock()
+		return
 	}
 	c.mu.Unlock()
-	// Wait for readLoop to finish
+	_ = c.SendAudio(nil, true)
+	<-c.closeCh
+}
+
+// Close forcefully shuts down the ASR connection.
+func (c *Client) Close() {
+	c.mu.Lock()
+	if c.closed {
+		c.mu.Unlock()
+		return
+	}
+	c.conn.Close()
+	c.mu.Unlock()
 	<-c.closeCh
 }