test: add 73 unit tests for app/api/deps.py auth dependencies
Cover all core authentication paths: helpers (_get_token_from_request, _validate_user_token, _get_user_model, _validate_customer_token), admin/store/merchant/customer auth (cookie + header + API variants), optional auth, store permission factories, and store ownership checks. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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