This commit deletes several files related to Passkey functionality, including CORS_TEST_ANLEITUNG.md, CROSS_DEVICE_DEBUG.md, CROSS_DEVICE_PROBLEM_ZUSAMMENFASSUNG.md, SMARTPHONE_TEST_ANLEITUNG.md, test-cors.html, test-smartphone.html, and Vue components for Passkey registration and recovery. These removals are part of a broader effort to streamline the codebase and focus on core authentication methods while Passkey support is under review.
