The simplest method is to replace the light control unit, the order number of the desired unit is GR1B-67-890A (B).
A more budgetary, but more sophisticated way, involves intervention in an electron.
There are wires in the photo, including a thin yellow wire and a thin brown wire with a red stripe. To make sure that these are necessary wires, you can check them: when the ignition is switched off, there must be a plus, when the ignition is switched on or the ignition is minus.
These wires need to be cut and broken by a button with two pairs of contacts. The button can be placed at a convenient location in the lounge. The lights will be switched off when the button is pressed.