[raphael-bynome]

Summary

Two audio defaults in the reference pages don't match the code.

• WHISPER_COMPUTE_TYPE: documented as float16 on CUDA with a fallback, but config.py sets os.getenv('WHISPER_COMPUTE_TYPE', 'int8') and routers/audio/__init__.py passes it as is; there is no device-based switch. Users on the :cuda image get int8 unless they set it.
• BYPASS_PYDUB_PREPROCESSING: env.py computes USE_SLIM or os.getenv(...), so it is always on in the slim image. The Azure STT page already says so; the two reference pages didn't.

Related issue or discussion

None.

Checklist

• I have reviewed the relevant documentation and matched the existing style.
• This PR meets Open WebUI's contribution standards: it is accurate, relevant to users, narrowly scoped, maintainable, and not promotional content, advertising, lead generation, SEO placement, or a request to list a product, service, provider, integration, gateway, tool, or company primarily for visibility.
• I understand that PRs that do not meet these standards may be closed without review and will not be merged. Repeated, low-quality, off-topic, promotional, or intentionally misleading submissions may result in the contributor being blocked from future participation in Open WebUI repositories.

Notes for reviewers

Checked against main at 0.13.0: backend/open_webui/config.py (WHISPER_COMPUTE_TYPE), backend/open_webui/routers/audio/__init__.py and backend/open_webui/env.py (BYPASS_PYDUB_PREPROCESSING).

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