Add SAA DMI editor to Tools page

Adds a new card to the web UI Tools page for reading and editing DMI
fields via SAA (In-Band). Reads current DMI configuration with GetDmiInfo,
displays all fields as an editable table, and applies only the changed
fields via EditDmiInfo + ChangeDmiInfo. Backs up the original DMI file to
dmi-backups/ before any write, making it available in the support bundle
for rollback. Also adds "saa" to the standard tool check list.

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

audit/internal/webui/tasks.go

@@ -137,9 +137,10 @@ type taskParams struct {
 	RampTotal          int      `json:"ramp_total,omitempty"`
 	RampRunID          string   `json:"ramp_run_id,omitempty"`
 	DisplayName        string   `json:"display_name,omitempty"`
-	Device             string   `json:"device,omitempty"` // for install
-	LBAF               int      `json:"lbaf,omitempty"`
-	PlatformComponents []string `json:"platform_components,omitempty"`
+	Device             string      `json:"device,omitempty"` // for install
+	LBAF               int         `json:"lbaf,omitempty"`
+	PlatformComponents []string    `json:"platform_components,omitempty"`
+	SAADmiChanges      []saaChange `json:"saa_dmi_changes,omitempty"`
 }
 
 type persistedTask struct {