test(admin/users): failure path and credential-storage tests

Two additional unit tests for create_verified_user:

* test_create_verified_user_stores_credentials — asserts a password
  credential row is persisted in user_credentials after creation
* test_create_verified_user_raises_on_duplicate_email — asserts an
  exception is raised when the same email is registered twice (enforced
  by the UNIQUE constraint on users.email)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Reviewed-By: Frederick M. Muriithi <fredmanglis@gmail.com>

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