Add event when `pause`/`unpause` toggles include actor role

[Jayy4rl]

• Description: Include actor role hint (admin/operator) in pause lifecycle events to improve audit clarity.
  This avoids extra chain reads when analyzing incident timelines.
• Key files: soroban-contracts/contracts/single_rwa_vault/src/lib.rs, events.rs
• Definition of done: Pause events enriched and backward-compatible for existing listeners.

[khalifa-zoro]

@khalifa-zoro has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Heyy there. Quite the intriguing issue you have here. If all's we'll by you, I'd love to work on and implement the solution for you

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[Junman140]

@Junman140 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I would love to work on this

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[DSOTec]

@DSOTec has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi, I would like to work on this issue. Kindly assign.

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[drips-wave]

Congratulations, @Junman140! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Junman140: 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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[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @Junman140 as part of the Stellar Wave Program's 4th Wave 🥳

Moderator's reason: [Auto-assessed] The PR #320 has been open for over 2.5 days (exceeding the 24-hour rule) without any maintainer objections. It directly addresses the requirements of issue #268 by implementing enriched pause events and maintaining backward compatibility while also resolving a build blocker.

😎 @Junman140: 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.