Support power saving service

[Ruben-Lohberg]

No description provided.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

PR Build Artifacts

• Android APK: Download Android build
• Linux Bundle: Download Linux build
• Windows Runner: Download Windows build
• Web Bundle: Download Web build

Full workflow run: https://github.com/OpenEarable/app/actions/runs/26561140137

[Ruben-Lohberg]

Checks fail because the required version of the flutter library is not yet merged.

[Ruben-Lohberg]

@DennisMoschina please review. The code is mostly generated by Codex

[github-actions]

Visit the preview URL for this PR (updated for commit 91bf31b):

https://open-earable-web--pr255-auto-off-mtvtnufb.web.app

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[DennisMoschina]

Looks good so far. Only comment I have is how differing modes in stereo devices are handled. For the microphone and audio mode, we display the mode for each device instead of merging it into the same mode automatically. @TobiasRoeddiger do we want the same behaviour for the power saving mode or is the approach with merging into the same mode acceptable?

[TobiasRoeddiger]

yes please do not merge them automatically