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/webui/server.go

@@ -263,6 +263,7 @@ func NewHandler(opts HandlerOptions) http.Handler {
 	mux.HandleFunc("POST /api/sat/abort", h.handleAPISATAbort)
 	mux.HandleFunc("POST /api/bee-bench/nvidia/perf/run", h.handleAPIBenchmarkNvidiaRunKind("nvidia-bench-perf"))
 	mux.HandleFunc("POST /api/bee-bench/nvidia/power/run", h.handleAPIBenchmarkNvidiaRunKind("nvidia-bench-power"))
+	mux.HandleFunc("GET /api/benchmark/results", h.handleAPIBenchmarkResults)
 
 	// Tasks
 	mux.HandleFunc("GET /api/tasks", h.handleAPITasksList)