Prefer PeeringDB aka/name for displayed ASN names

[digizeph]

Summary

• Apply a consistent preferred-name order (PeeringDB aka → name_long → name → as2org org_name → as2org name → core name) for all displayed ASN names.
• Update RPKI ASPA enrichment (cache + historical) to use the preferred-name logic.
• Extend AS2Rel name selection to the same preferred-name order.
• Keep raw asinfo core name unchanged in JSON/detail structs.

Testing

• Not run (not requested).

[digizeph]

This resolves issue #109