Rename package from httpauth to httpauthfirebase to follow ecosystem convention
(repo name = package name, hyphens removed). Bump httpauth dependency from
v0.1.0 to v1.0.0 and rbac indirect dependency from v0.9.0 to v1.0.0.
BREAKING CHANGE: import path unchanged (code.nochebuena.dev/go/httpauth-firebase)
but package identifier changes from httpauth to httpauthfirebase — remove any
import alias previously used to disambiguate from code.nochebuena.dev/go/httpauth.
EnrichmentMiddleware, AuthzMiddleware, IdentityEnricher, PermissionProvider,
and related types are removed from this module. They now live in
code.nochebuena.dev/go/httpauth, the provider-agnostic middleware layer.
AuthMiddleware is updated to call httpauth.SetTokenData, fulfilling the
integration contract between provider-specific auth and generic middleware.
This module now has a single responsibility: Firebase JWT verification.
BREAKING CHANGE: IdentityEnricher, PermissionProvider, EnrichmentMiddleware,
AuthzMiddleware, and WithTenantHeader are no longer exported from this package.
Import code.nochebuena.dev/go/httpauth for those identifiers.
rbac is a Tier 0 module (no micro-lib dependencies). The dependency line
incorrectly cited it as Tier 1. The module's own tier (4) is unchanged —
it remains the auth layer above the transport infrastructure.
