fix(music): default to music-3.0 and list current models

[octo-patch]

Reason: refresh the MiniMax music provider to the current music-3.0 model and model list.

The runtime MiniMax music generation provider still defaulted to minimax/music-2.5+ and advertised only the legacy music-2.5 variants. This refreshes the registered default and model list to the current generation models.

Changes:

• src/index.ts (buildMusicGenerationProvider): default model is now minimax/music-3.0 and the advertised models list now includes minimax/music-3.0, minimax/music-2.6, minimax/music-3.0-free, and minimax/music-2.6-free.
• src/proxy.ts (/v1/audio/generations handler): the fallback audioModel default is now minimax/music-3.0.
• test/test-e2e.ts: updated the mock upstream response and the local/live music fixtures to use minimax/music-3.0.

Checks run:

• npx tsc --noEmit — passed.
• npx vitest run — 723 passed / 3 skipped (one flaky lifecycle timeout passed on re-run; unrelated to this change).
• npx tsx test/test-e2e.ts — 20 passed / 0 failed (mocked audio generation path exercised with the refreshed model).

Summary by CodeRabbit

• New Features

  • Updated the default music generation model to minimax/music-3.0.
  • Added support for minimax/music-3.0, minimax/music-2.6, and their free variants.

• Bug Fixes

  • Audio generation requests without a specified model now use the updated default model.

• Tests

  • Updated music generation test coverage to use the latest default model.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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Review profile: CHILL

Plan: Pro Plus

Run ID: b87f7f93-4b7e-4c47-8341-55ae6775038f

📥 Commits

Reviewing files that changed from the base of the PR and between 22bdfbb and 9240831.

📒 Files selected for processing (3)

• src/index.ts
• src/proxy.ts
• test/test-e2e.ts

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📝 Walkthrough

Walkthrough

Changes

Music model update

Layer / File(s)	Summary
Provider and route defaults src/index.ts, src/proxy.ts	The BlockRun music provider now defaults to minimax/music-3.0 and exposes Music 3.0, 2.6, and free variants; the audio generation fallback also uses Music 3.0.
Music generation test alignment test/test-e2e.ts	Mock and live music-generation tests request, return, and reference minimax/music-3.0.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: 1bcmax

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: defaulting to music-3.0 and updating the advertised model list.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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