chore: drop legacy TUI/dead code

- Delete audit/internal/app/panel.go (388 lines, zero callers — TUI panel remnant)
- Delete RenderGPULiveChart() from platform/gpu_metrics.go (~155 lines, never called)
- Move formatSATDetail/cleanSummaryKey helpers to app.go (still used)
- Update motd: replace bee-tui with Web UI hint
- Update journald.conf.d comment: remove bee-tui reference

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

audit/internal/app/app.go

@@ -1023,3 +1023,62 @@ func (a *App) ListInstallDisks() ([]platform.InstallDisk, error) {
 func (a *App) InstallToDisk(ctx context.Context, device string, logFile string) error {
 	return a.installer.InstallToDisk(ctx, device, logFile)
 }
+
+func formatSATDetail(raw string) string {
+	var b strings.Builder
+	kv := parseKeyValueSummary(raw)
+
+	if t, ok := kv["run_at_utc"]; ok {
+		fmt.Fprintf(&b, "Run: %s\n\n", t)
+	}
+
+	lines := strings.Split(raw, "\n")
+	var stepKeys []string
+	seenStep := map[string]bool{}
+	for _, line := range lines {
+		if idx := strings.Index(line, "_status="); idx >= 0 {
+			key := line[:idx]
+			if !seenStep[key] && key != "overall" {
+				seenStep[key] = true
+				stepKeys = append(stepKeys, key)
+			}
+		}
+	}
+
+	for _, key := range stepKeys {
+		status := kv[key+"_status"]
+		display := cleanSummaryKey(key)
+		switch status {
+		case "OK":
+			fmt.Fprintf(&b, "PASS  %s\n", display)
+		case "FAILED":
+			fmt.Fprintf(&b, "FAIL  %s\n", display)
+		case "UNSUPPORTED":
+			fmt.Fprintf(&b, "SKIP  %s\n", display)
+		default:
+			fmt.Fprintf(&b, "?     %s\n", display)
+		}
+	}
+
+	if overall, ok := kv["overall_status"]; ok {
+		ok2 := kv["job_ok"]
+		failed := kv["job_failed"]
+		fmt.Fprintf(&b, "\nOverall: %s  (ok=%s  failed=%s)", overall, ok2, failed)
+	}
+
+	return strings.TrimSpace(b.String())
+}
+
+func cleanSummaryKey(key string) string {
+	idx := strings.Index(key, "-")
+	if idx <= 0 {
+		return key
+	}
+	prefix := key[:idx]
+	for _, c := range prefix {
+		if c < '0' || c > '9' {
+			return key
+		}
+	}
+	return key[idx+1:]
+}