feat(watchdog): hardware error monitor + unified component status store

- Add platform/error_patterns.go: pluggable table of kernel log patterns
  (NVIDIA/GPU, PCIe AER, storage I/O, MCE, EDAC) — extend by adding one struct
- Add app/component_status_db.go: persistent JSON store (component-status.json)
  keyed by "pcie:BDF", "storage:dev", "cpu:all", "memory:all"; OK never
  downgrades Warning or Critical
- Add webui/kmsg_watcher.go: goroutine reads /dev/kmsg during SAT tasks,
  writes Warning to DB for matched hardware errors
- Fix task status: overall_status=FAILED in summary.txt now marks task failed
- Audit routine overlays component DB statuses into bee-audit.json on every read

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

audit/internal/app/app.go

@@ -40,6 +40,8 @@ type App struct {
 	sat       satRunner
 	runtime   runtimeChecker
 	installer installer
+	// StatusDB is the unified component health store (nil if unavailable).
+	StatusDB *ComponentStatusDB
 }
 
 type ActionResult struct {
@@ -136,7 +138,7 @@ type runtimeChecker interface {
 }
 
 func New(platform *platform.System) *App {
-	return &App{
+	a := &App{
 		network:   platform,
 		services:  platform,
 		exports:   platform,
@@ -145,6 +147,10 @@ func New(platform *platform.System) *App {
 		runtime:   platform,
 		installer: platform,
 	}
+	if db, err := OpenComponentStatusDB(DefaultExportDir + "/component-status.json"); err == nil {
+		a.StatusDB = db
+	}
+	return a
 }
 
 // ApplySATOverlay parses a raw audit JSON, overlays the latest SAT results,
@@ -154,7 +160,7 @@ func ApplySATOverlay(auditJSON []byte) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
-	applyLatestSATStatuses(&snap.Hardware, DefaultSATBaseDir)
+	applyLatestSATStatuses(&snap.Hardware, DefaultSATBaseDir, nil)
 	return json.MarshalIndent(snap, "", "  ")
 }
 
@@ -174,7 +180,7 @@ func (a *App) RunAudit(runtimeMode runtimeenv.Mode, output string) (string, erro
 		}
 	}
 	result := collector.Run(runtimeMode)
-	applyLatestSATStatuses(&result.Hardware, DefaultSATBaseDir)
+	applyLatestSATStatuses(&result.Hardware, DefaultSATBaseDir, a.StatusDB)
 	if health, err := ReadRuntimeHealth(DefaultRuntimeJSONPath); err == nil {
 		result.Runtime = &health
 	}