Resolves provider-token records to qualified live usage sources.
Codex is a built-in source. GLM sources come from named providers that use a
Z.AI adapter or explicitly set usage_adapter: "glm".
Summary
Types
@type t() :: %LLMProxy.ProviderUsage.Source{ account_label: String.t(), adapter: module(), auth_scheme: :raw | :bearer | nil, base_url: String.t() | nil, config_error: String.t() | nil, provider_label: String.t(), stored_token: LLMProxy.Schemas.ProviderToken.t(), token_id: integer(), usage_paths: [String.t()] }