Backend: Add scheduled reconciliation drift detection with alert hooks

[Junirezz]

Context

reconciliationReport.ts exposes an on-demand drift report comparing Horizon ledger records to persisted DB state (Issue #724).

Problem / Gap

Reconciliation is manual-only. Drift (MISSING_IN_DB, AMOUNT_MISMATCH, etc.) is not detected proactively, so indexer gaps can go unnoticed until user-facing data is wrong.

Proposed approach

• Register a scheduled job (via jobGovernance.ts) that runs reconciliation over a rolling window.
• Emit structured logs and Prometheus counters when status === 'DRIFT_DETECTED'.
• Optionally open a webhook or alert hook when drift exceeds configurable thresholds.
• Store the last successful reconciliation summary for the diagnostics bundle.

Acceptance criteria

• Scheduled reconciliation runs on a configurable interval with retry/backoff.
• Drift counters and last-run timestamp appear in /metrics or job metrics endpoint.
• Admin can fetch the latest automated reconciliation summary without re-running Horizon queries.
• Tests cover clean and drifted scenarios with mocked ledger fetcher.

Files/areas affected

• backend/src/reconciliationReport.ts
• backend/src/positionReconciliationJob.ts
• backend/src/jobGovernance.ts
• backend/src/metrics.ts

[afeezorobsco-cyber]

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

Hi maintainer, can i work on this issue?

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[Osifowora]

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

​Hi maintainer, I would love to work on this issue. I can get started on it right away.

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[dhareymu]

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

Hi maintainer,

Please, I would love to work on this project to fix the issues for you. I promise to work on it swiftly and create a PR for it in no time.

I look forward to working with you. Thank you.

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[Bigdaddyobamo]

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

Hi Junirezz team, please kindly assign this to me. I can add the scheduled reconciliation job with retry/backoff, drift metrics, persisted latest-run summary, and focused clean/drift scenario tests.

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[king-aj-the-first]

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

Hii, i'd like to work on this issue

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