chat: user-friendly INFO logs for invite/connect flow

- chat_sync.c: invite entry, JOINED/TIMEOUT messages
- conn_mgr_core.c: invite start (addrs+udp+tcp), NCD UP/DOWN/TIMEOUT,
  TCP connect/ready/close, membership check send/receive/confirm/deny,
  overall timeout
- node_conn_direct.c: NCD event names instead of numbers

src/utun_instance.h

@@ -28,6 +28,7 @@ extern "C" {
 
 #include "etcp_api.h"
 #include "config_parser.h"
+#include "topo_group.h"
 
 // Forward declarations
 struct utun_config;
@@ -126,6 +127,7 @@ struct UTUN_INSTANCE {
     struct etcp_inst_cbk_entry* new_conn_cbks;
     struct etcp_status_cbk_entry* conn_status_cbks;  // instance-level: NEW/UP/DOWN/DELETE
     struct etcp_socket_cbk_entry* socket_cbks;       // instance-level: socket ADDR/STATUS changes
+    struct nodeinfo_cbk_entry* nodeinfo_cbks;         // глобальная подписка на изменения nodeinfo
     void* test_user_ptr;             // Generic user pointer (used by tests)
 
     struct memory_pool* data_pool;// для входных-выходных данных пакета