Add platform config ingest, storage, API, and UI tab

Auditors can now send BIOS/Redfish platform settings via
POST /ingest/hardware as hardware.platform_config (map[string]any).
Stored as latest-snapshot per machine with per-key change history.
Exposed via GET /api/assets/{id}/platform-config and .../history.
Asset page gets a third tab "Platform Config" with inline history expand.
Contract bumped to v2.9, migration 0024 adds two new tables.

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

internal/api/server.go

@@ -103,6 +103,7 @@ func NewServer(addr string, readTimeout, writeTimeout time.Duration, db *sql.DB)
 		failureRepo := failures.NewFailureRepository(db)
 		assetRepo := registry.NewAssetRepository(db)
 		assetLogRepo := registry.NewAssetEventLogRepository(db)
+		platformConfigRepo := registry.NewAssetPlatformConfigRepository(db)
 		componentRepo := registry.NewComponentRepository(db)
 		installationRepo := registry.NewInstallationRepository(db)
 		timelineRepo := timeline.NewEventRepository(db)
@@ -121,12 +122,13 @@ func NewServer(addr string, readTimeout, writeTimeout time.Duration, db *sql.DB)
 			Service: ingest.NewService(db),
 		})
 		RegisterAssetComponentRoutes(mux, AssetComponentDependencies{
-			Assets:        assetRepo,
-			AssetLogs:     assetLogRepo,
-			Components:    componentRepo,
-			Installations: installationRepo,
-			Timeline:      timelineRepo,
-			History:       historySvc,
+			Assets:         assetRepo,
+			AssetLogs:      assetLogRepo,
+			Components:     componentRepo,
+			Installations:  installationRepo,
+			Timeline:       timelineRepo,
+			History:        historySvc,
+			PlatformConfig: platformConfigRepo,
 		})
 		RegisterFailureRoutes(mux, FailureDependencies{
 			Failures:      failureRepo,