Add support for templates in automations in discharge_battery/charge_battery service

[lukaslisowski]

Description:
This PR changes the type of the power (watt) parameter for the sonnenbatterie.discharge_battery and charge_battery services from str to int to support the use of templates in automations.

Reason:
Previously, the service accepted the power value as a string. When using templates, this often resulted in a string with extra quotes, which caused parsing errors like:

invalid literal for int() with base 10: '"762"'

This occurred during later parsing of the watt value in the code.

By changing the parameter type to int, both templated and direct numeric values are now handled correctly, allowing for smoother integration in automations and avoiding type conversion errors.

[RustyDust]

Adding this PR would break the actions of the integration as can be verified in the developer tools, e.g. by running either the "charge_battery" or "discharge_battery" functions from there.

[lukaslisowski]

Yes, you're right. I’ve updated the service definition, it should be fixed now. I’ve tested it locally.

[RustyDust]

Yes, you're right. I’ve updated the service definition, it should be fixed now. I’ve tested it locally.

Sorry, my machine used for testing broke and it took me a while to get a replacement up and running.
Anyway, while the last updates to your patch fixes the services the actions still stay broken. Also, the function descriptions in the README would need updating as well.