feat(js/plugins/compat-oai): generalize STT module naming and add gpt-4o-mini-transcribe

[7hokerz]

Description here... Help the reviewer by:

• Renamed the STT module from whisper to a task-oriented name (stt) to avoid coupling the API surface to a specific model.
• Added gpt-4o-mini-transcribe as an additional STT model using the existing STT interface.
• (This model is intentionally chosen because it shares the same input and output semantics as gpt-4o-transcribe,
  allowing it to fit into the existing STT interface without introducing new response formats or API surface changes.)

Checklist (if applicable):

• [V] PR title is following https://www.conventionalcommits.org/en/v1.0.0/
• [V] Tested (manually, unit tested, etc.)
• [V] Docs updated (updated docs or a docs bug required)

[gemini-code-assist]

Summary of Changes

Hello @7hokerz, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the 'compat-oai' plugin by refactoring its Speech-to-Text (STT) module for improved generality and expanding its capabilities. The core change involves renaming the STT module to a more abstract name, which prevents tight coupling to a particular model and facilitates easier integration of diverse transcription services. Concurrently, it introduces support for the 'gpt-4o-mini-transcribe' model, leveraging the existing STT interface to provide additional transcription options without altering the current API structure.

Highlights

• Module Renaming: The Speech-to-Text (STT) module has been renamed from 'whisper' to 'stt' to decouple the API surface from a specific model implementation, promoting better modularity and future extensibility.
• New STT Model Support: Added support for 'gpt-4o-mini-transcribe' as a new Speech-to-Text model, integrating seamlessly with the existing STT interface due to its compatible input/output semantics with 'gpt-4o-transcribe'.

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[gemini-code-assist]

Code Review

This pull request effectively generalizes the Speech-to-Text (STT) module by renaming whisper.ts to stt.ts and updating the corresponding imports. This is a good change for maintainability as it decouples the module from a specific model name. The PR also adds support for the gpt-4o-mini-transcribe model, expanding the available STT capabilities. The changes are clear, concise, and align well with the existing structure of the codebase. Overall, this is a solid contribution.