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/page_export_tools.go

@@ -477,6 +477,8 @@ function installToRAM() {
 
 ` + renderNVMeFormatCard() + `
 
+` + renderSAADMICard() + `
+
 <script>
 function checkTools() {
   document.getElementById('tools-table').innerHTML = '<p style="color:var(--muted);font-size:13px">Checking...</p>';