unetmsg: close all channels on network removal

network_close() only closed the listening socket without shutting down
established RX/TX connections. This left remote state in
core.remote_publish/core.remote_subscribe for hosts on the removed
network, causing stale entries in channel listings and failed routing
attempts.

Close all RX and TX channels before removing the network, which also
triggers remote state cleanup via network_rx_socket_close().

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/network/services/unetmsg/files/usr/share/ucode/unetmsg/unetmsgd-remote.uc

@@ -449,6 +449,13 @@ function network_close(name)
 	net.timer.cancel();
 	net.handle.delete();
 	net.socket.close();
+
+	for (let peer, sock_data in net.rx_channels)
+		network_rx_socket_close(sock_data);
+
+	for (let peer, sock_data in net.tx_channels)
+		network_tx_socket_close(sock_data);
+
 	delete networks[name];
 }