Configure S3 lifecycle for old attachments

[augmentcode]

Solution

• Adds a backend script to apply a lifecycle rule for public/uploads/, moving attachments to Standard-IA after 90 days, plus simple operator docs.

Testing

• node --check src/scripts/configureS3AttachmentLifecycle.js
• node -e assertion for the generated default lifecycle config.

Misc

• Manual-session GitHub OAuth tooling was unavailable, so this PR was opened with the org GitHub App.

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Pull Request opened by Augment Code | View session

[augmentcode]

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[augmentcode]

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