[BE-25] Build UserActivityDashboardService

[mftee]

Problem

Users have no way to review their own recent activity history on the platform. The ActivityTrackerService exists but is not exposed through any user-facing endpoint, making user activity invisible.

Proposed Solution

Create a UserActivityDashboardService inside backend/src/module/user-activity/ that exposes the current user's activity log through a dedicated endpoint.

Acceptance Criteria

• GET /api/module/users/me/activity returns the most recent 50 activity events for the authenticated user
• Each activity record includes: id, actionType, resourceType, resourceId, metadata (JSON), and timestamp
• Supports optional startDate and endDate query parameters for date-range filtering
• Results are always ordered by timestamp descending
• Returns an empty array (not 404) when the user has no activity records
• Protected by JwtAuthGuard — users can only view their own activity

[kike-alt]

@kike-alt has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi can i work on this ?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @kike-alt to this issue.

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Congratulations, @kike-alt! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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[drips-wave]

This issue has been completed by @kike-alt as part of the Stellar Wave Program's 5th Wave 🥳

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