fix: loadAudioDevices accesses .devices from response object

API.listAudioDevices() returns {devices: [...]} not the array
directly. The response also uses card numbers hw:X,Y format.

src/web/ui-v2-dist/index.html

@@ -455,7 +455,7 @@ async function loadAudioDevices(){
   const outSel=document.getElementById('audioOutputDevice');
   if(!inSel||!outSel)return;
   const devs=await API.listAudioDevices();
-  const opts=(devs||[]).map(d=>{
+  const opts=((devs&&devs.devices)||[]).map(d=>{
     const id='hw:'+d.card+','+d.device;
     return '<option value="'+id+'">'+d.name+' ('+d.desc+')</option>';
   }).join('')||'<option value="">No devices</option>';