Gemini STT: add latest google models for STT

[Prajna1999]

Summary

Target issue is #764
Added support for "gemini-2.5-flash", "gemini-3.1-pro-preview", "gemini-3-flash-preview" as optional models for Google alongside default gemini-2.5.-pro

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases.

Notes

Please add here if any other information is required for the reviewer.

[coderabbitai]

📝 Walkthrough

Walkthrough

The change expands the list of supported Google Speech-to-Text (STT) models by adding three new Gemini model variants (gemini-3.1-pro-preview, gemini-3-flash-preview, gemini-2.5-flash) to the existing SUPPORTED_MODELS configuration constant.

Changes

Cohort / File(s)	Summary
STT Model Configuration backend/app/models/llm/constants.py	Expanded Google STT supported models list from a single default model to include three additional Gemini model variants.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A rabbit's voice now has more ears,
Three Gemini whispers through the years,
More models bloom, our choices grow wide,
Speech flows freely far and side! 🌟

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically summarizes the main change: adding latest Google models (gemini-3.1-pro-preview, gemini-3-flash-preview, gemini-2.5-flash) for STT support.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/add-other-models-for-google

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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