[fix](trx-server): enable audio by default and fix playback thread panic

Enable audio streaming by default in AudioConfig.

Fix panic in audio playback thread caused by calling
tokio::runtime::Handle::current() from a plain std::thread.
Use rx.blocking_recv() instead, which is the correct API for
consuming a tokio mpsc receiver from a synchronous context.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>

src/trx-server/src/audio.rs

@@ -206,22 +206,19 @@ fn run_playback(
     stream.play()?;
     info!("Audio playback: started");
 
-    let rt = tokio::runtime::Handle::current();
     let mut pcm_buf = vec![0f32; frame_samples];
 
-    rt.block_on(async {
-        while let Some(packet) = rx.recv().await {
-            match decoder.decode_float(&packet, &mut pcm_buf, false) {
-                Ok(decoded) => {
-                    let mut ring = ring_writer.lock().unwrap();
-                    ring.extend(&pcm_buf[..decoded * channels as usize]);
-                }
-                Err(e) => {
-                    warn!("Opus decode error: {}", e);
-                }
+    while let Some(packet) = rx.blocking_recv() {
+        match decoder.decode_float(&packet, &mut pcm_buf, false) {
+            Ok(decoded) => {
+                let mut ring = ring_writer.lock().unwrap();
+                ring.extend(&pcm_buf[..decoded * channels as usize]);
+            }
+            Err(e) => {
+                warn!("Opus decode error: {}", e);
             }
         }
-    });
+    }
 
     Ok(())
 }

src/trx-server/src/config.rs

@@ -172,7 +172,7 @@ pub struct AudioConfig {
 impl Default for AudioConfig {
     fn default() -> Self {
         Self {
-            enabled: false,
+            enabled: true,
             listen: IpAddr::V4(std::net::Ipv4Addr::LOCALHOST),
             port: 4533,
             rx_enabled: true,
@@ -305,7 +305,7 @@ mod tests {
         assert!(config.listen.enabled);
         assert_eq!(config.listen.port, 4532);
         assert!(config.listen.auth.tokens.is_empty());
-        assert!(!config.audio.enabled);
+        assert!(config.audio.enabled);
         assert_eq!(config.audio.port, 4533);
         assert_eq!(config.audio.sample_rate, 48000);
     }