fix: voice upload uses send() via server, not client-side sendToRVS_raw

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

diagnostic/index.html

@@ -1249,7 +1249,7 @@
     }
 
     function loadXTTSVoices() {
-      sendToRVS_raw({ type: 'xtts_list_voices', payload: {}, timestamp: Date.now() });
+      send({ action: 'xtts_list_voices' });
     }
 
     function arrayBufferToBase64(buffer) {
@@ -1284,11 +1284,7 @@
         const totalSize = samples.reduce((s, f) => s + f.size, 0);
         status.textContent = `Sende ${samples.length} Sample(s) (${(totalSize / 1024).toFixed(0)}KB)...`;
 
-        sendToRVS_raw({
-          type: 'voice_upload',
-          payload: { name, samples },
-          timestamp: Date.now(),
-        });
+        send({ action: 'voice_upload', name, samples });
 
         status.textContent = `Gesendet — warte auf Bestaetigung vom XTTS-Server...`;
       } catch (err) {