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/admin_ssh_console.h

@@ -14,8 +14,9 @@
 extern "C" {
 #endif
 
-/* Nonblocking typed Serial-settings admission to the canonical dispatcher. */
+/* Nonblocking typed settings admission to the canonical dispatcher. */
 esp_err_t admin_ssh_console_submit_serial_settings(uint32_t id);
+esp_err_t admin_ssh_console_submit_account_settings(uint32_t id);
 
 /* Fits the longest supported ECDSA P-256 OpenSSH key import command. */
 #define ADMIN_SSH_CONSOLE_COMMAND_LINE_CAPACITY 256U