fix: log actual adapter-node listening address

[puneetdixit200]

closes #15880

This fixes the adapter-node startup log so it uses the actual bound server address instead of manually echoing the configured host and port.

That matters when PORT=0, because Node binds an available random port and the old log still printed port 0. The new helper also formats IPv6 hosts with brackets so the logged address is a valid URL.

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The focused regression test failed before the fix because format_listening_address did not exist, then passed after the runtime helper was added.

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Latest commit: 21eb8d1

The changes in this PR will be included in the next version bump.

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Name	Type
@sveltejs/adapter-node	Patch

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