feat(contracts): emit events for all admin actions in LoanManager for audit trail

[Akpolo]

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Problem

The LoanManager contract has no audit trail for admin actions. When an admin calls approve_loan(), set_min_score(), set_interest_rate(), set_default_window(), or pause(), no event is emitted. Off-chain monitoring tools have no way to detect unauthorized admin changes or spot patterns like repeated score threshold changes.

Expected Behavior

Every admin action should emit a named event with:

1. The action type (e.g. AdminAction)
2. The function called
3. Old and new values where applicable
4. The admin address

Suggested Fix

Add env.events().publish((Symbol::new(&env, "AdminAction"), action_name), (old_value, new_value)) to each admin-gated function in contracts/loan_manager/src/lib.rs.

Location

contracts/loan_manager/src/lib.rs in all admin functions

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Congratulations, @promisszn! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @promisszn: 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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[promisszn]

please close this @ogazboiz

[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @promisszn as part of the Stellar Wave Program's 3rd Wave 🥳

Moderator's reason: [Auto-assessed] The contributor successfully addressed the issue by adding event emissions for admin actions in the LoanManager contract. Although the issue remains open, the corresponding PR #487 has been merged, and the work clearly fulfills the core requirements of providing an audit trail.

😎 @promisszn: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here.

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ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.