server/ln: Allow Unregistered VTXOs in anti-dos attestation

Duncan Deanrequested to merge
2026-07-allowunregvtxoslnantidos into master

Summary by CodeRabbit

  • Bug Fixes
    • Lightning receives can now use eligible unregistered VTXOs for anti-DoS ownership proofs.
    • Banned, spent, and otherwise unspendable VTXOs continue to be rejected.
    • Prevented valid Lightning receives from failing when a selected VTXO has not yet been registered.
Edited by coderabbit

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