feat(dut-network): allow DNS hostnames in public_ip field

[ambient-code]

Summary

• Add _resolve_ip() helper to DutNetwork driver that resolves DNS hostnames to IPv4 addresses using socket.getaddrinfo(), passing through valid IP addresses unchanged
• Integrate resolution in _get_1to1_mappings() and add_static_lease() so hostname-based public_ip values are resolved before being used in nftables rules and IP aliases
• Add 7 unit tests covering IP passthrough, DNS resolution, error handling, and end-to-end 1:1 NAT setup with hostnames

Closes #666

Test plan

• All 36 tests in test_driver.py pass (including 7 new tests)
• All 144 tests in the dut-network package pass
• Linting passes (make lint-fix)
• Verify with a real DNS hostname in a lab config (manual)

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• Commit unit tests in branch fix/666-dns-name-entries

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[mangelajo]

@ambient-code please rebase and fix conflict.

[mangelajo]

@ambient-code please rebase again

[ambient-code]

@mangelajo Done — the branch was already up to date with main (no new commits to rebase onto), but I found and fixed the actual CI failure: the three TestDnsNameIn1to1 tests were passing static_leases= to _make_driver() instead of addresses=. This was the leftover from the static_leases → addresses rename. Pushed a fixup commit (211a6ffa).