etcp_connect + BGP_READY callbacks + router reconnect test

- etcp_connect.c: async connect API with EARLY/LATE/BGP_READY callbacks
- etcp_connect.h: declaration (via etcp_api.h)
- connect_deliver: fix to preserve unfired callback nodes
- etcp_set_routing_exchange_state: fires bgp_ready_cbk on TABLE_COMPLETE
- route_bgp: TABLE_COMPLETE handler + route_bgp_send_table_complete
- etcp.c: connections_count tracking, cleanup on close
- test_etcp_router_reconnect: a-b-c topology with b restart (etcp_connect)
- test_etcp_connect: unit tests for async connect API
- etcp_router: inflight/retrans/close improvements
- Various proxy/NAT/router cleanups

src/utun_instance.c

@@ -265,7 +265,8 @@ struct UTUN_INSTANCE* utun_instance_create_from_config(struct UASYNC* ua, struct
         DEBUG_ERROR(DEBUG_CATEGORY_MEMORY, "Failed to allocate UTUN_INSTANCE");
         return NULL;
     }
-    
+    instance->etcp_connect_timeout_tb = 20000;
+
     // Initialize using common function (config ownership transferred to instance)
     if (instance_init_common(instance, ua, config) != 0) {
         // Cleanup on error - caller still owns config since we failed
@@ -517,7 +518,7 @@ int utun_instance_init(struct UTUN_INSTANCE *instance) {
     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_ID_MSG_TRANSPORT);
+                                        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;