feat(analytics): Implement content performance metrics

[zeemscript]

Description

Create comprehensive content performance metrics to help creators understand how their courses and books are performing. Track views, user engagement, and completion rates to identify high-performing content and areas for improvement.

Acceptance Criteria

• Track view counts for each course and book
• Calculate engagement metrics (time spent, interaction rate)
• Monitor completion rates for courses
• Provide comparative analytics across all content

Files to Create

• src/routes/analytics/content-performance.ts - Content performance endpoints
• src/services/analytics/content-metrics-service.ts - Content metrics calculation
• src/utils/analytics/engagement-calculator.ts - Engagement metric utilities

[dotmantissa]

@dotmantissa has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Please, assign this issue to me.

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[abdulqoyumadegoke]

@abdulqoyumadegoke has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi team! I'm ready to tackle this task. My technical background aligns well with this issue, and I can have a clean, tested Pull Request ready for review within your expected timeframe. Please let me assign me so I can begin

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[Fury03]

@Fury03 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I'd like to work on this issue. I've reviewed the requirements and have a clear implementation plan. If assigned, I'll submit a high-quality PR that follows the project's guidelines.

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[drips-wave]

Congratulations, @Fury03! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Fury03: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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