feat: Implement core voicebot functionality with TeamSpeak 3 and xAI integration.

internal/client/voice.go

@@ -117,6 +117,10 @@ func (c *Client) SendVoice(pcm []int16) error {
 	channels := 1
 	codec := uint8(CodecOpusVoice)
 
+	// Protect shared encoder
+	c.VoiceEncoderMu.Lock()
+	defer c.VoiceEncoderMu.Unlock()
+
 	// Get or Create Encoder
 	if c.VoiceEncoder == nil {
 		var err error