[Feature Request] Custom reimbursement rate for specific deferrable load (e.g. EV charger)

[Polarium37]

Hi @davidusb-geek,

First of all, a big thank you for your amazing work on EMHASS and its Home Assistant add-on – it’s a truly powerful and valuable tool!

I’d like to suggest a feature enhancement:
Would it be possible to support a custom reimbursement rate for a specific deferrable load, such as an EV charger?

In my case, my employer reimburses electricity at €0.22/kWh when I charge my vehicle at home.
It would be great if this could be accounted for in the optimization, either via costfun_per_deferrable_load or a new parameter such as bonus_cost_ev.

Thanks again for your work and support!