Добавлен group_id в etcp_router и topo_group, удалён msg_transport

- etcp_router: SVC_ROUTE_HDR (+8B), ETCP_ROUTER_CONN/TRANSIT_QUEUE хеши расширены под group_id
- Все caller'ы (proxy, routing, conn_mgr, nat, chatgui, tests) обновлены
- topo_group: глобальный реестр TOPO_NODE по node_id, ref_count=0 при создании
- BGP-обмен активируется для всех групп (а не только дефолтной)
- Протокол: group_id добавлен в WITHDRAW/TABLE_REQ/TABLE_COMPLETE/ERR_GROUP_MISMATCH
- Per-connection коллбэки заменены на instance-level conn_status
- msg_transport полностью удалён из проекта
57/57 тестов

src/utun_instance.c

@@ -16,7 +16,7 @@
 #include "db_sync.h"
 #include "stcp_server.h"
 #include "control_server.h"
-#include "msg_transport.h"
+
 #include "../lib/u_async.h"
 #include "../lib/debug_config.h"
 #include "../lib/sha256.h"
@@ -399,13 +399,6 @@ void utun_instance_destroy(struct UTUN_INSTANCE *instance) {
     ntp_time_destroy(instance);
     ntp_node_time_destroy(instance);
 
-    // Shutdown message transport server
-    if (instance->msg_t) {
-        DEBUG_INFO(DEBUG_CATEGORY_GENERAL, "Shutting down message transport server");
-        msg_transport_shutdown(instance->msg_t);
-        instance->msg_t = NULL;
-    }
-
     // Shutdown control server first
     if (instance->control_srv) {
         DEBUG_INFO(DEBUG_CATEGORY_CONTROL, "Shutting down control server");
@@ -635,21 +628,6 @@ int utun_instance_init(struct UTUN_INSTANCE *instance) {
         }
     }
     
-    // Initialize message transport server if configured
-    if (instance->config->global.msg_transport_sock.ss_family != 0) {
-        int mt_ret = msg_transport_init(&instance->msg_t, instance, instance->ua,
-                                        &instance->config->global.msg_transport_sock,
-                                        8, ETCP_RT_ID_MSG_TRANSPORT);
-        if (mt_ret != 0) {
-            DEBUG_WARN(DEBUG_CATEGORY_GENERAL, "Failed to initialize msg_transport, continuing without IPC transport");
-            instance->msg_t = NULL;
-        } else {
-            DEBUG_INFO(DEBUG_CATEGORY_GENERAL, "Message transport server initialized");
-        }
-    } else {
-        instance->msg_t = NULL;
-    }
-    
     // Start the main loop
     instance->running = 1;