. Add `GET /api/v1/admin/dashboard` endpoint

[DeFiVC]

What: Add an admin dashboard endpoint that returns platform-wide statistics (total users, enrollments, quiz completions, credentials minted, rewards claimed).

Why: Admins need a high-level view of platform health and growth. Currently there's no aggregate statistics endpoint.

Scope: Create endpoint that queries aggregate stats: total users, new users (today/week/month), total enrollments, quiz completion rate, total credentials, total rewards claimed. Include trend data (comparisons with previous period).

Acceptance criteria:

• Returns all key platform metrics
• Includes trend comparisons
• Cached for 5 minutes
• Only accessible by admins

Technical context: src/database/schema.ts — all tables. src/modules/users/user.service.ts — aggregate queries.

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[Nathanpvd]

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

Hello, I'd really like to contribute to this issue and would appreciate the opportunity. Thank you for your consideration.

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[frankrichard99]

@frankrichard99 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I would like to to work o this issue

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[codemagician1949]

@codemagician1949 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hiiii Maintainer, can diligently resolve this in 3hrs, providing full test coverage

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Congratulations, @codemagician1949! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

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