`plaid_eu` is registered as a separate Provider::ConfigurationRegistry
entry but had no Provider::Metadata row, so its card in the
Available grid fell through to the gray-500 default and rendered
empty (no region, kind, tier, or tagline). The title also came out
as "Plaid Eu" because `titleize` doesn't know "EU" is an initialism.
- Add a `plaid_eu` row to Provider::Metadata::REGISTRY with the same
shape as `plaid` (US → EU, otherwise identical).
- Introduce an optional `name:` field in metadata; controller falls
back to it before titleizing the provider key. Lets `plaid_eu`
render as "Plaid EU".
- Add the missing `settings.providers.taglines.plaid_eu` translation.
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