feat(keyboard): Add ble battery level report (AEGHB-1109)

[Deadline039]

Description

Add battery monitor and BLE battery level report.

Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• [N/A] Documentation is updated as needed.
• [N/A] Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

	Messages
📖	You might consider squashing your 4 commits (simplifying branch history).

👋 Hello Deadline039, we appreciate your contribution to this project!

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[lijunru-hub]

@YanKE01 See if it can be handled by the battery voltage estimation component instead.

[YanKE01]

Hi, @Deadline039 . Thank you very much for your contribution. We currently have an adc_battery_estimation component that you can try using and testing.

[Deadline039]

Hi, @Deadline039 . Thank you very much for your contribution. We currently have an adc_battery_estimation component that you can try using and testing.

I have modified the code for battery estimation. I tested it, and it worked well. Thanks for your suggestions.

[lijunru-hub]

@leebo Please add a MR tag

[leeebo]

sha=66a300c11435744e3b08e26805d71f7ab62aa430