fix: memory pool alloc mismatch in tests, db_sync SEND_DATA buffer overflow

- test_etcp_router_reconnect, test_etcp_connect, test_stcp_traffic:
  replace u_calloc with memory_pool_alloc for TOPO_SOCKMETA4/TOPO_ADDR4
- db_sync.c: fix req[14] -> req[15] — SEND_DATA request header is 15 bytes
  (type:1 + from:4 + count:2 + vp:4 + want_from:4)

src/control_server.h

@@ -19,7 +19,7 @@ extern "C" {
 /* Forward declarations */
 struct UTUN_INSTANCE;
 struct UASYNC;
-struct TOPO_NODEQ;
+struct TOPO_GROUP_NODE;
 struct ll_queue;
 
 /* Forward declaration */
@@ -117,7 +117,7 @@ void control_server_process_updates(struct control_server* server);
  */
 uint32_t control_server_get_client_count(const struct control_server* server);
 
-void control_server_notify_node_change(struct control_server* server, struct TOPO_NODEQ* node);
+void control_server_notify_node_change(struct control_server* server, struct TOPO_GROUP_NODE* node);
 void control_server_notify_node_removed(struct control_server* server, uint64_t node_id);
 
 #ifdef __cplusplus