etcp: link_status = remote_keepalive && recv_keepalive (вместо только remote)

- link_status теперь требует двусторонней слышимости: remote && local
- recv_keepalive восстанавливается ДО вычисления link_status (избегает заклинивания)
- loadbalancer_link_ready по переходу 0→1 с проверкой was_up

src/etcp_connections.c

@@ -1569,21 +1569,23 @@ process_decrypted:
     pkt->noencrypt_len=0;
     pkt->link=link;
 
-    link->remote_keepalive=pkt->flag_up;
+    link->remote_keepalive = pkt->flag_up;
-    if ( link->remote_keepalive && !link->link_status && link->initialized) loadbalancer_link_ready(link);// up выставляем только если и remote=up и local=up
-    link->link_status=link->remote_keepalive;
 
-    link->last_recv_local_time=get_time_tb();
+    /* restore recv_keepalive BEFORE computing link_status = remote && local */
-    link->last_recv_timestamp=pkt->timestamp;
-    link->last_recv_updated=1;
-
-    // Mark link as up when receiving packets
     if (link->recv_keepalive != 1) {
         link->recv_keepalive = 1;
-//        loadbalancer_link_ready(link);
         DEBUG_INFO(DEBUG_CATEGORY_CONNECTION, "[%s] Link %p (local_id=%d) status changed to UP - packet received",
                    link->etcp->log_name, link, link->local_link_id);
     }
+
+    int was_up = link->link_status;
+    link->link_status = link->remote_keepalive && link->recv_keepalive;
+    if (link->link_status && !was_up && link->initialized)
+        loadbalancer_link_ready(link);
+
+    link->last_recv_local_time=get_time_tb();
+    link->last_recv_timestamp=pkt->timestamp;
+    link->last_recv_updated=1;
     
     // Count decrypted bytes
     link->total_decrypted += pkt->data_len;