Add power results table, fix benchmark results refresh, bound memtester

- Benchmark page now shows two result sections: Performance (scores) and
  Power / Thermal Fit (slot table). After any benchmark task completes
  the results section auto-refreshes via GET /api/benchmark/results
  without a full page reload.
- Power results table shows each GPU slot with nominal TDP, achieved
  stable power limit, and P95 observed power. Rows with derated cards
  are highlighted amber so under-performing slots stand out at a glance.
  Older runs are collapsed in a <details> summary.
- memtester is now wrapped with timeout(1) so a stuck memory controller
  cannot cause Validate Memory to hang indefinitely. Wall-clock limit is
  ~2.5 min per 100 MB per pass plus a 2-minute buffer.

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

audit/internal/platform/sat.go

@@ -552,9 +552,13 @@ func (s *System) RunMemoryAcceptancePack(ctx context.Context, baseDir string, si
 	if passes <= 0 {
 		passes = 1
 	}
+	// Bound memtester with a hard wall-clock timeout: ~2.5 min per 100 MB per
+	// pass, plus a fixed 2-minute buffer. Without this, a stuck memory
+	// controller can cause memtester to spin forever on a single subtest.
+	timeoutSec := sizeMB*passes*150/100 + 120
 	return runAcceptancePackCtx(ctx, baseDir, "memory", []satJob{
 		{name: "01-free-before.log", cmd: []string{"free", "-h"}},
-		{name: "02-memtester.log", cmd: []string{"memtester", fmt.Sprintf("%dM", sizeMB), fmt.Sprintf("%d", passes)}},
+		{name: "02-memtester.log", cmd: []string{"timeout", fmt.Sprintf("%d", timeoutSec), "memtester", fmt.Sprintf("%dM", sizeMB), fmt.Sprintf("%d", passes)}},
 		{name: "03-free-after.log", cmd: []string{"free", "-h"}},
 	}, logFunc)
 }