Route WebRTC sideband joins to the Realtime API - #35830
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## What changed - Use `https://api.openai.com/v1` for WebRTC sideband websocket joins instead of deriving the URL from the model provider. - Keep `experimental_realtime_ws_base_url` as an explicit sideband override for local development and tests. - Exclude provider query parameters when building sideband URLs. ## Testing - Add coverage that a frameless sideband join uses `wss://api.openai.com/v1/live/rtc_test` even when the provider points at the ChatGPT backend. - Update the sideband retry end-to-end test to inject its mock server URL through the new override. GitOrigin-RevId: 5d3d2cd69905ba04143010ced36a22712825b563
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Route WebRTC sideband joins to the Realtime API
What changed
https://api.openai.com/v1for WebRTC sideband websocket joins instead of deriving the URL from the model provider.experimental_realtime_ws_base_urlas an explicit sideband override for local development and tests.Testing
wss://api.openai.com/v1/live/rtc_testeven when the provider points at the ChatGPT backend.