fix: update last_recv_local_time on INIT packet receive to prevent spurious keepalive timeout

last_recv_local_time was not set in the server INIT processing path,
causing the keepalive timer to see a stale timestamp and trigger a
false link-down → route_bgp_remove_conn() right after reconnect.
Routes could be deleted before the first normal packet from the
client updated the timestamp via process_decrypted.

src/etcp_connections.c

@@ -1563,6 +1563,8 @@ void etcp_connections_read_callback_socket(socket_t sock, void* arg) {
     pkt->noencrypt_len=0;
     pkt->link=link;
     link->recv_keepalive = 1;
+    link->last_recv_local_time = get_time_tb();
+    link->last_recv_timestamp = pkt->timestamp;
 
     int xoffset=sizeof(*ack_repl_hdr);
     // padding