Add broker management and writer transfer UI

src/web_broker_settings.h

@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-3.0-only */
+#pragma once
+#include <stdint.h>
+#include "esp_http_server.h"
+
+/* Optional admin-only snapshot and login-isolated typed assignment/results. */
+esp_err_t web_broker_settings_handler(httpd_req_t *request);
+esp_err_t web_broker_operation_handler(httpd_req_t *request);
+void web_broker_settings_execute(uint32_t id);