[emynogithub]

Summary

• Add a single invoice maturity worker that settles funded invoices after their due date.
• Prevent overlapping worker cycles and stop the worker when the server closes.
• Make the worker's enabled state, polling interval, and batch size configurable through maturity settings.

Closes #627

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[TS-mfon]

✅ PR Ready for Review

Due to a recent malware incident affecting our repositories, all PRs are required to pass automated security checks before being reviewed for merging.

This PR has passed all automated checks:

• ✅ Security scan — no malicious code detected
• ✅ No merge conflicts

A maintainer will review and merge this PR shortly.

[TS-mfon]

✅ PR Ready for Review

Due to a recent malware incident affecting our repositories, all PRs are required to pass automated security checks before being reviewed for merging.

This PR has passed all automated checks:

• ✅ Security scan — no malicious code detected
• ✅ No merge conflicts

A maintainer will review and merge this PR shortly.