Add RESTART command for master and slaves via ESP-NOW.

UART RESTART (client_id 0 = local reboot, >0 = unicast); dashboard and CLI hooks; delayed esp_restart after response.

Co-authored-by: Cursor <cursoragent@cursor.com>

goTool/client_api.go

@@ -178,6 +178,12 @@ func (m *managedSerial) FindMe(clientID uint32) error {
 	})
 }
 
+func (m *managedSerial) Restart(clientID uint32) error {
+	return m.withPort(func(sp *serialPort) error {
+		return runRestartClient(sp, clientID)
+	})
+}
+
 func (s *serialPort) ledRingProgress(req *pb.LedRingProgressRequest) (*pb.LedRingProgressResponse, error) {
 	msg := &pb.UartMessage{
 		Type: pb.MessageType_LED_RING,