Add typed account and password settings

- Add admin account list, create, role, delete, and password workflows
- Execute identity-checked mutations through the existing dispatcher
- Bound queued credential lifetime and wipe transient secrets
- Add explicit password generation with saved-value acknowledgement
- Handle self-revocation and uncertain outcomes without automatic
  retries
- Register optional account routes without disrupting terminal
  transports
- Expand host regressions and document contracts and pending target
  checks

Validated host suites and pio run; hardware validation remains pending.

src/CMakeLists.txt

@@ -32,6 +32,7 @@ idf_component_register(
         "web_security.c"
         "web_serial_transport.c"
         "web_serial_settings.c"
+        "web_account_settings.c"
         "web_admin_tickets.c"
         "web_admin_transport.c"
         "web_assets_data.c"