Fix GPU model propagation, export filenames, PSU/service status, and chart perf

- nvidia.go: add Name field to nvidiaGPUInfo, include model name in
  nvidia-smi query, set dev.Model in enrichPCIeWithNVIDIAData
- pages.go: fix duplicate GPU count in validate card summary (4 GPU: 4 x …
  → 4 x … GPU); fix PSU UNKNOWN fallback from hw.PowerSupplies; treat
  activating/deactivating/reloading service states as OK in Runtime Health
- support_bundle.go: use "150405" time format (no colons) for exFAT compat
- sat.go / benchmark.go / platform_stress.go / sat_fan_stress.go: remove
  .tar.gz archive creation from export dirs — export packs everything itself
- charts_svg.go: add min-max downsampling (1400 pt cap) for SVG chart perf
- benchmark_report.go / sat.go: normalize GPU fallback to "Unknown GPU"

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

audit/internal/platform/benchmark.go

@@ -335,11 +335,7 @@ func (s *System) RunNvidiaBenchmark(ctx context.Context, baseDir string, opts Nv
 		return "", fmt.Errorf("write summary.txt: %w", err)
 	}
 
-	archive := filepath.Join(baseDir, "gpu-benchmark-"+ts+".tar.gz")
-	if err := createTarGz(archive, runDir); err != nil {
-		return "", fmt.Errorf("pack benchmark archive: %w", err)
-	}
-	return archive, nil
+	return runDir, nil
 }
 
 func normalizeNvidiaBenchmarkOptionsForBenchmark(opts NvidiaBenchmarkOptions) NvidiaBenchmarkOptions {