fix(webui): fix sensor grouping and fan card visibility

- Tccd1-8 (AMD CCD die temps) now classified as 'cpu' group,
  appear on CPU Temperature chart instead of ambient
- Fan RPM card hidden when no fans detected
- Remove CPU Load/Mem Load/Power from fan table (have dedicated charts)

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

audit/internal/platform/live_metrics.go

@@ -304,6 +304,7 @@ func classifyLiveTempGroup(chip, name string) string {
 		strings.Contains(text, "x86_pkg_temp"),
 		strings.Contains(text, "tctl"),
 		strings.Contains(text, "tdie"),
+		strings.Contains(text, "tccd"),
 		strings.Contains(text, "cpu"),
 		strings.Contains(text, "peci"):
 		return "cpu"