Rust SDK: implement admin.dlq.list() / admin.dlq.requeue(id)

[Mac-5]

Description
Wrap GET /dlq and POST /dlq/:id/requeue (dlq_routes in src/handlers/dlq.rs) as admin.dlq.list() and admin.dlq.requeue(id). List dead-letter queue entries and requeue a specific failed transaction by ID.

Scope guardrail: this PR must only touch files under sdks/rust/. Do not touch anything under src/ — read the handler referenced below only to learn the request/response contract.

Requirements and context

• Uses the admin client (see the admin client variant issue).
• Must handle this edge case explicitly: requeuing an ID that no longer exists in the DLQ must surface as a clear "not found" error, not a silent success or a generic 500.
• Depends on Issue Create Reusable Transaction Query Module #3.

Suggested execution

1. Fork the repo and create a branch
   git checkout -b feature/rust-sdk-implement-admindlqlist-admindlqrequeueid
2. Implement changes
   • Read src/handlers/dlq.rs to confirm the exact request/response shape (dlq_entries, count, and the requeue response message/dlq_id fields).
   • Implement admin.dlq.list() returning the entries list and count, and admin.dlq.requeue(id) returning the confirmation.
   • Add the response model types needed, matching the handler's actual fields.
3. Test and commit
   • Run the crate's test command and confirm it's green
   • Example commit message: feat(sdk): add admin dlq resource methods

Guidelines

• Assignment required before starting
• PR description must include: Closes #118
• PR must only touch files under sdks/rust/
• Complexity: High (200 points) — Every issue in this Wave is tagged High — full points regardless of individual scope.

[blockchainrafik]

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

Good day maintainer,
I will like to work on this issue,
With years of experience in software engineering, Getting this issue fixed without regression is assured.
ETA: 2hrs

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[paulpeter32-coder]

@paulpeter32-coder has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi maintainer I'm a fullstack developer and I would love to work on this issue

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[coredevdave-cmd]

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

i can work on this , can you assign this to me

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[drips-wave]

Congratulations, @coredevdave-cmd! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @coredevdave-cmd: 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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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@coredevdave-cmd's PR #773 was approved and merged by @Mac-5.

🏆 @coredevdave-cmd: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (296 total points). Track your full progress on GrantFox.

👏 Great work, @coredevdave-cmd! Keep contributing to Synapse-bridgez.