fix(api): dont 500 on cross dc response

[MasterPtato]

Fixes RVT-6105

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[railway-app]

🚅 Deployed to the rivet-pr-4449 environment in rivet-frontend

Service	Status	Web	Updated (UTC)
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[MasterPtato]

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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.
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• fix(cache): clean up lib #4457
• fix(config): allow configuring topo dcs via map, fix pg ssl mode config #4456
• fix(api): dont 500 on cross dc response #4449 👈 (View in Graphite)
• chore: update byte units on frontend #4444
• fix: runner alloc idx logic, api auth for actor get #4443
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[linear]

RVT-6105 Cross-DC proxy escalates 400 client errors to 500 internal errors

[pkg-pr-new]

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commit: 8ee527a

[claude]

PR Review: fix(api): dont 500 on cross dc response. The reqwest_to_axum_response function previously used anyhow::bail!() on non-2xx remote DC responses, causing 500s to be returned to clients. The fix correctly logs the error and falls through to forward the actual status code. Structured logging follows CLAUDE.md conventions. Fix is correct and minimal.