[juliendemoutiez]

Description of change

Attachment uploads fail with a 500 when S3_REGION is not set:

Region not accepted: region="-" is not a valid hostname component.

The S3 hook falls back to region: '-' when no region is configured. Since the
@aws-sdk/client-s3 bump in #100 (3.698.0 → 3.1132.0), the SDK requires the region to
be a valid hostname component and rejects '-'.

Current behavior: uploads fail on staging. Prod still works only because it runs a
build from before #100. It will break the same way on its next deploy.

New behavior: the fallback region is us-east-1. With a custom endpoint (Scaleway),
the region is only used for SigV4 signing, so any valid value works.

Pull-Request Checklist

• Code is up-to-date with the main branch
• npm run lint passes with this change
• npm run test passes with this change
• This pull request links relevant issues as Fixes #0000 — N/A
• There are new or updated unit tests validating the change — N/A (no test setup for ally against the SDK)
• Documentation has been updated to reflect this change — N/A
• The new commits follow conventions outlined in the conventional commit spec — follows the repo's gitmoji convention

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