keepalive handshake: device_type + keepalive negotiation in UDP/TCP INIT

- Добавлен device_type (1 байт, CLIENT_TYPE_*) в INIT_REQUEST и INIT_RESPONSE
- Добавлен keepalive_interval (2 байта) в INIT_RESPONSE
- STCP handshake расширен с 43 до 46 байт (device_type+keepalive)
- negotiate_keepalive(): оба desktop/server → min, иначе (есть mobile) → max
- keepalive_interval вынесен в UTUN_INSTANCE для использования в handshake
- stcp_client_connect() принимает device_type и keepalive_interval
- peer_device_type/peer_keepalive_interval передаются через stcp_link в ETCP_LINK

tools/chatgui-android/libutun_lite/instance_lite.c

@@ -161,7 +161,10 @@ static void chat_event_forward(int type, const uint8_t* data, int len) {
 static void nodeinfo_event_cb(struct TOPO_GROUP* group, struct TOPO_GROUP_NODE* nq, void* arg) {
     (void)group; (void)arg;
     if (!nq || !g_event_handler) return;
-    uint16_t best_rtt = node_best_rtt(nq);
+    uint16_t best_rtt = topo_get_chain_rtt(nq);
+    DEBUG_INFO(DEBUG_CATEGORY_DEBUG, "nodeinfo_cb: nid=%016llx pres=%02x up=%02x rtt=%u(0x%04X) paths=%zu",
+               (unsigned long long)nq->node_id, nq->conn_presence, nq->conn_up,
+               best_rtt, best_rtt, nq->paths ? queue_entry_count(nq->paths) : 0);
     uint8_t data[12];
     memcpy(data, &nq->node_id, 8);
     data[8] = nq->conn_presence;
@@ -299,6 +302,7 @@ static void* instance_thread(void* arg) {
     etcp_router_bind(g_inst, ETCP_RT_ID_CHAT_SYNC, NULL);
 
     utun_add_nodeinfo_cbk(g_inst, nodeinfo_event_cb, NULL);
+    etcp_add_link_status_cbk(g_inst, on_link_status_changed, NULL);
 
     /* Set my_name from config */
     if (g_inst->config->global.name[0]) {
@@ -433,8 +437,11 @@ int instance_lite_start(const char* config_text) {
     debug_config_init();
     debug_set_level(DEBUG_LEVEL_INFO);
     debug_set_category_level(DEBUG_CATEGORY_SYS, DEBUG_LEVEL_INFO);
-    debug_set_category_level(DEBUG_CATEGORY_CHAT_SYNC, DEBUG_LEVEL_TRACE);
-    debug_set_category_level(DEBUG_CATEGORY_MEMBER_SYNC, DEBUG_LEVEL_TRACE);
+    debug_set_category_level(DEBUG_CATEGORY_CHAT_SYNC, DEBUG_LEVEL_INFO);
+    debug_set_category_level(DEBUG_CATEGORY_MEMBER_SYNC, DEBUG_LEVEL_INFO);
+    debug_set_category_level(DEBUG_CATEGORY_DEBUG, DEBUG_LEVEL_INFO);
+    debug_set_category_level(DEBUG_CATEGORY_ETCP, DEBUG_LEVEL_INFO);
+    debug_set_category_level(DEBUG_CATEGORY_DUMP, DEBUG_LEVEL_WARN);
     debug_enable_function_name(0);
 
     cfg_get_val(config_text, "db_path", g_db_path, sizeof(g_db_path));