feat: implement analytics, experimentation, search autocomplete and s…

[sketcherzee]

Summary

This PR delivers major platform growth and retention improvements by implementing:

• Implement search suggestions and autocomplete #545 Search suggestions and autocomplete
• Implement comprehensive event tracking system #546 Comprehensive event tracking system
• Implement A/B testing framework for experiments #548 A/B testing framework enhancements
• Implement subscription management system #554 Subscription management system

Changes

#545 Search Suggestions & Autocomplete

• Added autocomplete API endpoint
• Added search suggestions based on course names
• Added trending search support
• Improved course discovery experience
• Optimized response time for search suggestions
• Added tests covering autocomplete behavior

#546 Event Tracking System

• Created reusable Event SDK

• Added event validation schema

• Implemented tracking for:

  • signup
  • login
  • course_view
  • purchase

• Added event batching for improved performance

• Integrated analytics backend

• Added E2E test coverage for event collection

#548 A/B Testing Framework

• Simplified experiment creation workflow
• Added experiment templates
• Implemented statistical significance calculations
• Added experiment results dashboard
• Added automatic experiment stopping when significance threshold is reached
• Added documentation and usage examples

#554 Subscription Management

• Added subscription pause endpoint
• Added subscription resume endpoint
• Implemented upgrade and downgrade proration logic
• Added retry handling for failed renewals
• Improved subscription lifecycle management
• Added automated test coverage

Validation

• Backend tests pass
• E2E analytics tests pass
• Search suggestion performance validated
• Experiment calculations verified
• Subscription lifecycle scenarios tested
• Documentation updated

Closes #545
Closes #546
Closes #548
Closes #554

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