Capture call path traffic alongside aggregate transmission queues

src/call/call.c

@@ -1027,6 +1027,8 @@ static void call_audio_batch_tick(void* arg) {
         struct etcp_tx_snapshot transport;
         if (etcp_tx_get_snapshot(s->ctx->inst, now, &transport) == 0)
             snapshot.transport_bytes = transport.queued_bytes + transport.inflight_bytes;
+        struct ETCP_ROUTER_PATH path = etcp_router_get_path(s->ctx->inst, s->group_id, s->peer_node_id, ETCP_RT_ID_CALL_AUDIO);
+        snapshot.peer_id = path.next_hop_node_id; snapshot.tx_epoch = path.tx_epoch; snapshot.wire_tx_bytes = path.wire_tx_bytes;
         audio->record_tx(s->call_id, &snapshot);
     }
     if (call_audio_batch_step(&s->audio_batch, now, found ? &net : NULL))

src/call/call_audio_history.h

@@ -20,6 +20,7 @@ struct call_history_rx {
 };
 struct call_history_tx {
     uint64_t at_ms, queued_bytes, inflight_bytes, transport_bytes;
+    uint64_t peer_id, tx_epoch, wire_tx_bytes; /* Текущий путь звонка: разность счётчиков только при одинаковых peer/epoch. */
 };
 struct call_audio_history {
     uint64_t now_ms;