Add integration test for holdings endpoint returning entries sorted by total value descending

[Chucks1093]

Summary

The wallet holdings response should be sorted by total holding value descending by default so the most valuable position appears first. An integration test with holdings of different values should confirm this ordering.

Scope

• Seed a wallet with three creator holdings of different values (balance × price)
• Call GET /wallets/:address/holdings with no sort param
• Assert entries are ordered highest total value first

Acceptance Criteria

• Default sort is total value descending
• Entry with highest value appears first
• Entry with lowest value appears last

ETA: 12 hours

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Coordinate on Telegram

[Luchistack]

Hi! I’m a full-stack developer with a strong blockchain background. I’d love to handle this issue and can deliver a clean, reliable solution. Kindly assign it to me.

[techAlhaji]

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Can i work on this please?

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[Kappa16]

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Please maintainer..I can handle this professionally and make sure this issue is closed ASAP WITHOUT ERRORS.

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[extolkom]

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Please assign me

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[drips-wave]

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

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Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #516)
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