Expand admin SSH command capabilities

Add per-session history, tab completion, interactive prompts, and
bounded input handling. Support deferred lifecycle and host-key actions
after output drains, and document the expanded administration workflow.

src/system_console.c

@@ -6,6 +6,7 @@
 #include <stdint.h>
 #include <stdio.h>
 
+#include "admin_ssh_console.h"
 #include "esp_console.h"
 #include "esp_heap_caps.h"
 #include "esp_system.h"
@@ -47,6 +48,15 @@ static int command_reboot(int argc, char **argv)
         return 1;
     }
 
+    if (admin_ssh_console_dispatch_is_remote()) {
+        esp_err_t error = admin_ssh_console_dispatch_defer(ADMIN_SSH_DEFER_REBOOT, 0U);
+        if (error != ESP_OK) {
+            printf("Could not schedule reboot: %s\n", esp_err_to_name(error));
+            return 1;
+        }
+        printf("Reboot scheduled after SSH output drains; unsaved changes will be lost.\n");
+        return 0;
+    }
     printf("Rebooting now; unsaved RAM-only configuration changes will be lost.\n");
     fflush(stdout);
     /* Give the UART driver time to transmit the acknowledgement before reset. */