refactor: split socket meta 'type' into config_type and nat_type — separate config (PUBLIC/NAT/PRIVATE) from detected NAT (EIM/STRICT/DIRECT) across NODEINFO, conn_mgr, route_bgp, route_node, etcpmon; win32 compat fixes (memmem, SHUT_WR, tun test_mode, tcp_proxy guards)

src/control_server.c

@@ -985,6 +985,7 @@ static void send_socket_list(struct control_server* server, struct control_clien
             info[i].ip[sizeof(info[i].ip) - 1] = '\0';
             info[i].port = 0;
         }
+        info[i].config_type = sock->type;
         info[i].nat_type = sock->nat_type;
         
         /* NAT address from socket (set when INIT_RESPONSE received) */