Module auth 

JWT authentication middleware for Haima.

Reuses lago_auth::jwt for token validation. Haima does not need Lago session mapping — it only validates that the caller holds a valid JWT signed with the shared secret.

Behaviour:

• If no JWT secret is configured, auth is disabled (local dev mode) and a warning is logged on startup.
• If a secret IS configured, all protected routes require a valid Authorization: Bearer <token> header.

Structs

AuthConfig

Auth configuration injected as axum state.

Functions

require_auth

Axum middleware that validates JWT bearer tokens on protected routes.