fix(voice): honor client config for streamed STT

[sylvesterkaczmarek]

Summary

Make streamed OpenAI STT honor the supplied AsyncOpenAI client's endpoint, query, headers, and dynamic credentials instead of bypassing client configuration.

OpenAISTTTranscriptionSession previously connected directly to:

wss://api.openai.com/v1/realtime?intent=transcription

and constructed its authorization header directly from client.api_key. That bypassed client routing/query/header configuration and could also materialize an empty or stale credential when the client uses a callable API-key provider.

Fix

• derive WebSocket routing from the configured OpenAI client
• merge client.default_query with the same Omit / NotGiven semantics as Responses WebSocket
• propagate auth/default headers while filtering omission sentinels
• refresh callable/rotating API keys before materializing handshake headers
• keep intent=transcription and OpenAI-Log-Session: 1 as STT-specific call-site values
• centralize client-derived WebSocket URL/query/header/credential normalization in a shared internal helper used by both Responses WebSocket and streamed STT

Test plan

Coverage verifies:

• custom base_url and websocket_base_url
• merged client query parameters and omission semantics
• auth, organization/project, and custom headers
• omitted organization/project headers are not stringified
• callable API keys are refreshed before the STT handshake
• existing STT connection tests use client doubles with the routing/query/header attributes read by this path

Risk

Low. With the default OpenAI client configuration, streamed STT still connects to wss://api.openai.com/v1/realtime?intent=transcription. Behavior changes only for configured routing, headers, query parameters, or dynamic credentials.

Issue number

None. Found while auditing parity between streamed and non-streamed STT client configuration.

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[seratch]

Thanks for the contribution. The underlying issue is valid: streamed STT currently bypasses the supplied AsyncOpenAI client's endpoint, query, and header configuration.
Before merging, please update the existing STT connection test doubles with the URL, query, auth-header, and default-header attributes now read by this path; those tests currently fail before reaching the mocked connection. Please also incorporate the callable-key refresh and regression coverage from #4537 before materializing auth headers.

Finally, keep the client-derived WebSocket URL, query, header, and credential normalization in a shared internal helper used by both Responses WebSocket and streamed STT, while leaving each transport's endpoint suffix and fixed parameters at its call site.

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[sylvesterkaczmarek]

Addressed. I moved the callable-key refresh/regression from #4537 into this PR, updated the existing STT connection doubles with the client routing/query/header attributes, and centralized the OpenAI-client WebSocket URL/query/header/credential normalization so Responses WebSocket and streamed STT share the same helper while keeping their endpoint-specific suffixes and fixed parameters at the call sites.

[seratch]

@sylvesterkaczmarek Can you complete these open PRs before sending further PRs? Thanks for your contributions!

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[seratch]

Thanks for working on this. Resolved by #4575