fix: suppress ytmsearch unsupported scheme error, clean up search log

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/novasonic-server.js

@@ -228,17 +228,20 @@ async function downloadTrack({ jobId, artist, albumArtist, title, album, year, t
     fs.readdirSync(dir).filter(f => AUDIO_EXTS.some(e => f.endsWith(`.${e}`))).length;
 
   // Step 1: YouTube Music — music-specific index, far fewer false positives
-  log(jobId, `🎵 YouTube Music: "${query}"`);
+  // Falls silently if this yt-dlp version doesn't support ytmsearch (older Alpine package)
   const countBefore = audioFileCount();
   try {
+    log(jobId, `🎵 YouTube Music: "${query}"`);
     await runYtdlp(`ytmsearch:${query}`);
   } catch (e) {
+    if (!e.message.includes('Unsupported url scheme')) {
       log(jobId, `⚠️  YouTube Music Fehler: ${e.message}`);
     }
+  }
 
   // Step 2: Fallback to regular YouTube if no file was produced
   if (audioFileCount() === countBefore) {
-    log(jobId, `🔄 Fallback: YouTube (5 Ergebnisse) — "${query}"`);
+    log(jobId, `🔍 YouTube: "${query}"`);
     await runYtdlp(`ytsearch5:${query}`);
   }