Auth

Authentication-adjacent endpoints (login URLs, locale).

📄️Get login metadata (unauthenticated)

Returns auth metadata for the calling client. Currently a placeholder that echoes a static login URL; intended to evolve into the tenant-aware login bootstrap.

📄️Update the current user's locale

Persists the chosen locale on the Cognito user (best-effort coerced to one of the supported languages). The bearer token in `Authorization` identifies the user.