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;
-    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->remote_keepalive = pkt->flag_up;
+
+    /* restore recv_keepalive BEFORE computing link_status = remote && local */
+    if (link->recv_keepalive != 1) {
+        link->recv_keepalive = 1;
+        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;
-
-    // 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);
-    }
     
     // Count decrypted bytes
     link->total_decrypted += pkt->data_len;