feat: emit DeviceUpdateType.Paired when a device consumes a pair code

[hhvrc]

Adds a Paired value to the DeviceUpdateType enum and emits it when a device consumes a pair code, so clients are notified when a device pairs.

This is useful for closing the pairing dialog automatically after device has paired

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[stage-review]

Ready to review this PR? Stage has broken it down into 3 individual chapters for you:

	Title
1	Add Paired value to DeviceUpdateType enum
2	Inject DeviceUpdateService into DeviceController
3	Emit paired update when consuming pair code

_{Chapters generated by Stage for commit b221847 on Jul 3, 2026 10:13am UTC.}

[Copilot]

Pull request overview

This PR adds a new device update event (DeviceUpdateType.Paired) and emits it when a device consumes a pair code, enabling clients to react to device pairing via the existing device-update delivery mechanisms (SignalR + Redis pub/sub).

Changes:

• Add DeviceUpdateType.Paired to the shared update-type enum.
• Inject IDeviceUpdateService into DeviceController and emit a Paired device update after pair-code consumption.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
Common/Models/DeviceUpdateType.cs	Adds the new Paired update type for pairing notifications.
API/Controller/Device/_ApiController.cs	Injects IDeviceUpdateService into DeviceController for emitting updates.
API/Controller/Device/Pair.cs	Emits DeviceUpdateType.Paired after consuming a pair code (targeting the device owner).

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