[Backend] — Feature: Add `GET /admin/users/:id/activity` paginated user activity log

[Olowodarey]

Background

Admins can view the platform-wide activity log but cannot filter it to a single
user. Investigating suspicious behavior requires scrolling through all platform
events. A per-user activity view is needed.

Goal

Add GET /admin/users/:id/activity returning the paginated ActivityLog for a
specific user.

Requirements

1. In AdminService, add:

2. Add the route to AdminController:

Acceptance criteria

• Returns paginated logs for the specific user.
• Empty array for users with no logged activity.

[Biokes]

@Biokes has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer, I will like to work on this issue and get it done.

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[ritik4ever]

@ritik4ever has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi,
I’d be happy to work on this issue if it’s still available. I’m a full-stack developer with experience in both Web2 and Web3 technologies, and I’ve contributed to several open-source projects. After reviewing the issue, I’m confident I can implement the required changes and submit a quality PR promptly.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@ritik4ever's PR #1233 was approved and merged by @Olowodarey.

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👏 Great work, @ritik4ever! Keep contributing to Arena1X.

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This issue has been completed by @ritik4ever as part of the Stellar Wave Program's 6th Wave 🥳

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