[PRODUCT] Implement personalized content feed with AI recommendations

Product Requirement

Users should see personalized content based on their behavior, preferences, and engagement patterns.

User Story

As a user, I want to see content recommendations that match my interests so that I spend less time searching and more time engaging.

Acceptance Criteria

• Real-time recommendations API integrated
• Mobile apps display personalized feed
• Web dashboard shows recommendations
• A/B test shows 20%+ engagement lift
• Recommendation refresh on user action

Success Metrics

• CTR on recommendations: > 15%
• Time to first engagement: < 30 seconds
• User satisfaction: > 4.3/5

Dependencies

• ai-recommendation-engine #8 (API)
• ios-app personalization UI
• android-app personalization UI
• web-dashboard integration

Epic

Part of Epic &5 (AI-Powered Personalization Platform)