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

[Chucks1093]

Summary

The holdings endpoint should sort entries by total holding value descending so the most valuable position appears first. An integration test with three holdings of different values should confirm the default ordering without a sort param.

Scope

• Seed a wallet with three creator holdings at prices that produce distinct total values
• Call GET /wallets/:address/holdings with no sort param
• Assert the entry with the highest total value appears first
• Assert the entry with the lowest total value appears last

Acceptance Criteria

• Highest value entry is first in the response
• Lowest value entry is last
• Order is by total value, not by balance or price alone

ETA: 12 hours

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Coordinate on Telegram

[BigJohn-dev]

Pls allow me fix this

[gloskull]

Hi, I’d love to work on this issue. I have 4 years of experience across backend, frontend, full-stack, and smart contract development. I understand the task clearly and can deliver a clean, efficient, well-tested solution on time, with strong focus on code quality and maintainability. My PR will be submitted in under 10 hours.