* Battery control: add api
* wip
* wip
* add battery discharge UI and state
* Publish controllable
* Reset to normal when disabling
* minor
* wip
* wip
* Revert mode on shutdown
* refactored tests, renamed method in site_battery (#10859)
* Fix linter
* only show option if controllable; not supported message instead
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Co-authored-by: Michael Geers <michael@geers.tv>
Co-authored-by: Michael Heß <GrimmiMeloni@users.noreply.github.com>
