Summary

• Remove legacy recommendation personalization surfaces: events, feedback, onboarding, metrics, and the settings toggle.
• Keep Home and Shorts recommendations on the simpler subscriptions/favorites related-stream flow.
• Remove obsolete personalization tests and update remaining contracts.

Verification

• JAVA_HOME=/usr/lib/jvm/java-21-openjdk ./gradlew test shadowJar
• CI dev 25446601415 passed
• Coverage dev 25446599419 passed
• Docker dev 25446599395 passed
• Beta image revision 15a8c4e tested
• Beta curls: /recommendations/home 200, /recommendations/shorts 200, removed personalization routes 404