Add typed serial settings operations

Route bounded admin mutations through the existing administration
dispatcher,
covering apply, lifecycle, persistence, authorization, and result
tracking.
Add the browser controls, automatic result refresh, regression coverage,
and
phase documentation.

src/admin_ssh_console.h

@@ -14,6 +14,9 @@
 extern "C" {
 #endif
 
+/* Nonblocking typed Serial-settings admission to the canonical dispatcher. */
+esp_err_t admin_ssh_console_submit_serial_settings(uint32_t id);
+
 /* Fits the longest supported ECDSA P-256 OpenSSH key import command. */
 #define ADMIN_SSH_CONSOLE_COMMAND_LINE_CAPACITY 256U