De-duplicate code to build Tuya device info

[epenet]

Proposed change

Just making sure that the code is shared to avoid future divergence

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
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• New feature (which adds functionality to an existing integration)
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• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @tuya, @zlinoliver, mind taking a look at this pull request as it has been labeled with an integration (tuya) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

This PR refactors the Tuya integration to centralize device registry metadata construction in a shared helper, reducing duplication and risk of future drift.

Changes:

• Added get_device_info() helper in homeassistant/components/tuya/util.py to build a DeviceInfo payload (with an initial=True mode for “unsupported” model labeling).
• Updated TuyaEntity to set _attr_device_info from the shared helper instead of implementing its own device_info property.
• Updated the coordinator device registration path to reuse the same helper when creating the device registry entry.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
homeassistant/components/tuya/util.py	Introduces shared get_device_info() helper returning DeviceInfo for consistent device registry data.
homeassistant/components/tuya/entity.py	Uses _attr_device_info = get_device_info(device) and removes duplicated device_info implementation.
homeassistant/components/tuya/coordinator.py	Replaces inline device registry fields with **get_device_info(device, initial=True) during device registration.

[erwindouna]

Thanks @epenet!