[client] Add IPv6 dual-stack UI support

[lixmal]

Describe your changes

Add IPv6 support to the iOS and tvOS client UI, complementing the Go-side changes in netbirdio/netbird#5738.

• Display IPv6 address in peer cards and peer detail sheets
• Add "Disable IPv6" toggle to iOS advanced settings and tvOS settings
• Configure NEIPv6Settings on the tunnel interface when an IPv6 address is assigned
• Handle IPv6 address change notifications from the Go SDK
• Persist disable-IPv6 preference via ConfigurationProvider (App Group on iOS, JSON config on tvOS)

Checklist

• I have performed a self-review of my own code
• Is a feature enhancement

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ed66ed57-77b2-4172-a26a-e3325d1a79d8

📥 Commits

Reviewing files that changed from the base of the PR and between b8eca1d and 8fbeabc.

📒 Files selected for processing (13)

• .github/workflows/build-upload.yml
• .github/workflows/testflight.yml
• NetBird/Source/App/ViewModels/MainViewModel.swift
• NetBird/Source/App/Views/AdvancedView.swift
• NetBird/Source/App/Views/Components/PeerCard.swift
• NetBird/Source/App/Views/Components/PeerDetailSheet.swift
• NetBird/Source/App/Views/TV/TVSettingsView.swift
• NetBirdTVNetworkExtension/PacketTunnelProvider.swift
• NetbirdKit/ConfigurationProvider.swift
• NetbirdKit/NetworkChangeListener.swift
• NetbirdKit/StatusDetails.swift
• NetbirdNetworkExtension/PacketTunnelProvider.swift
• NetbirdNetworkExtension/PacketTunnelProviderSettingsManager.swift

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/ipv6-support

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[github-actions]

TestFlight build failed for ac703e2

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[lixmal]

/testflight client-ipv6-android-ui

[github-actions]

TestFlight build failed for 8fbeabc

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[lixmal]

@coderabbitai review

[coderabbitai]

✅ Actions performed

Review triggered.

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[github-actions]

TestFlight build failed for 8fbeabc

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