fix(webui): restore chart legend, remove GPU numeric table

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

audit/internal/webui/pages.go

@@ -436,7 +436,6 @@ func renderMetrics() string {
   <div class="card-head">GPU — Temperature</div>
   <div class="card-body" style="padding:8px">
     <img id="chart-gpu-all-temp" src="/api/metrics/chart/gpu-all-temp.svg" style="width:100%;display:block;border-radius:6px" alt="GPU temperature">
-    <div id="gpu-table" style="margin-top:8px;font-size:12px"></div>
   </div>
 </div>
 
@@ -459,16 +458,6 @@ es.addEventListener('metrics', e => {
   const fanCard = document.getElementById('card-server-fans');
   if (fanCard) fanCard.style.display = (d.fans && d.fans.length > 0) ? '' : 'none';
 
-  let gpuHTML = '';
-  (d.gpus||[]).forEach(g => {
-    gpuHTML += '<tr><td>GPU '+g.index+'</td>' +
-      '<td>'+g.temp_c+'°C</td>' +
-      '<td>'+g.usage_pct+'% load</td>' +
-      '<td>'+g.mem_usage_pct+'% mem</td>' +
-      '<td>'+g.power_w+' W</td></tr>';
-  });
-  const gt = document.getElementById('gpu-table');
-  if (gt) gt.innerHTML = gpuHTML ? '<table>'+gpuHTML+'</table>' : '';
 });
 es.onerror = () => {};
 </script>`

audit/internal/webui/server.go

@@ -625,7 +625,7 @@ func renderChartSVG(title string, datasets [][]float64, names []string, labels [
 	opt := gocharts.NewLineChartOptionWithData(datasets)
 	opt.Title = gocharts.TitleOption{Text: title}
 	opt.XAxis.Labels = sparse
-	opt.Legend = gocharts.LegendOption{SeriesNames: names, Show: gocharts.Ptr(false)}
+	opt.Legend = gocharts.LegendOption{SeriesNames: names}
 	if yMin != nil || yMax != nil {
 		opt.YAxis = []gocharts.YAxisOption{{
 			Min:            yMin,