Update README to include ZBT-2 support

[googanhiem]

Added information about Home Assistant Connect ZBT-2 support.

Summary by CodeRabbit

• Documentation
  • Updated the Home Assistant device and firmware guidance to include Home Assistant Connect ZBT-2.
  • Clarified that Yellow, Connect ZBT-1, and Connect ZBT-2 support automatic installation of the correct RCP firmware.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c529ef61-1b8c-4ef3-8e14-f6ba84118f0f

📥 Commits

Reviewing files that changed from the base of the PR and between 6b5084c and ba56e60.

📒 Files selected for processing (1)

• openthread_border_router/README.md

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📝 Walkthrough

Walkthrough

The OpenThread Border Router README now lists Home Assistant Connect ZBT-2 alongside Yellow and Connect ZBT-1 as supported hardware with automatic RCP firmware installation.

Changes

Supported hardware documentation

Layer / File(s)	Summary
Update supported hardware list openthread_border_router/README.md	Adds Connect ZBT-2 to the supported Home Assistant hardware listed in the note.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: updating the README to add Home Assistant Connect ZBT-2 support information.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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• Create PR with unit tests

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_{Comment @coderabbitai help to get the list of available commands.}

[agners]

Hm, this comment was initially written when the app flashed the firmware automatically. But this got removed with #4061 from the app.

So either we remove this from the README.md entirely, or we state at least that Core is able to flash the firmware for this hardware.

@puddly thoughts?

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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