data/repositories/data_auth_repository library

Data-layer implementation of AuthRepository. Uses AuthBaseOperations for all mutations to preserve the original credential-error detection and response normalization behavior. Token header extraction (getToken, getTokenFirebase) also uses AuthBaseOperations.extractResponseHeaders.

FLAG: Vendure-specific methods delegate to AuthBaseOperations which is the original auth pipeline. VendureRemoteDataSource is not used for auth mutations because the error handling differs from the generic pipeline.