Use generic trades query for owner endpoint

[findolor]

Summary

• route GET /v1/trades/{owner} through the generic get_trades SDK path with an owner filter
• preserve existing pagination, time filter, exact count, and response shape

Benchmark context

Local benchmark against the bootstrapped DB showed the owner-specific SDK path taking roughly 3-4s for 20-row pages. Using the generic owner-filtered trades query reduced the same endpoint to roughly 1-2.7s while keeping the same pagination totals.

Validation

• nix develop -c cargo fmt
• nix develop -c cargo check
• nix develop -c rainix-rs-static

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/trades-owner-generic-query

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[findolor]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Use generic trades query for owner endpoint #110 👈 (View in Graphite)
• Improve order endpoint trade lookup #109
• Add branch-deployable preview API infrastructure #108
• main

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