Celia Chen 899539c03a Reuse route-aware clients for OpenAI file uploads (#35717) ...

## What changed

- Store a request-logging-disabled `RouteAwareClientPool` in session services and use it for file creation, blob upload, and finalization requests.
- Preserve the existing system-root fallback for transport-default proxy routes, and emit a warning event when that fallback is used.
- Remove the direct `reqwest` dependency from `codex-api` now that uploads use the shared HTTP abstraction.

## Testing

- Add coverage for completing multiple uploads through a shared client pool.

GitOrigin-RevId: 01842415cad2d349a6bd3869abb3332e8110ebce

2026-07-28 04:54:32 +00:00

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