chore: update OpenAPI schema

[fishaudio-bot]

Auto-generated update from https://api.fish.audio/openapi.json

Summary by CodeRabbit

• Changes
  • Updated the default voice used by agent configurations.
  • Updated the default language model to Google Gemini 3.6 Flash.
  • Expanded session creation documentation to explain timezone overrides, validation, and fallback to the client’s timezone.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 8260153b-ac6c-40ad-ac40-a63b683f4864

📥 Commits

Reviewing files that changed from the base of the PR and between 85e3d36 and da6f66a.

📒 Files selected for processing (1)

• api-reference/openapi.json

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📝 Walkthrough

Walkthrough

The OpenAPI schema documents timezone and client_timezone behavior. It updates the default LLM model and voice model identifiers.

Changes

OpenAPI Schema Updates

Layer / File(s)	Summary
Document timezone field behavior api-reference/openapi.json	The timezone and client_timezone descriptions document override, fallback, forwarding, and invalid-value behavior.
Update schema default values api-reference/openapi.json	The default AgentLLMConfigRedacted model changes to google/gemini-3.6-flash. The default AgentVoiceConfig voice ID changes to b347db033a6549378b48d00acb0d06cd.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

Suggested reviewers: kilerd

Merge Risk: ⚪ Minimal · up to da6f6

This change updates API documentation and published defaults; no concrete merge-blocking production impact is identified, so it is merge-ready after normal checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: updating the OpenAPI schema.

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