[Add/Update Registries] for S1256 4.8.7

[frassefraze]

Add/Update Registries Request

Heatpump model:
S1256

Firmware version:
4.8.7

Attached CSV File:
modbus_addresses_all_20260225-06589925314005-2.json

I might have done this in the wrong order, but already created a PR #284 to add in FLM (FLM S45) registries when docked to a S1256