docs: add MiniMax-M3 and update minimax default model

[octo-patch]

Summary

• Add MiniMax-M3 (latest flagship) to the minimax and minimax-cn provider docs and use it as the default in the quickstart code samples.
• Drop the older MiniMax-M2.5 / M2.5-highspeed / M2.1 / M2 rows from the model tables since they are no longer recommended for new integrations.
• Keep MiniMax-M2.7 and MiniMax-M2.7-highspeed as previous-generation options.
• Update the provider unit tests to use MiniMax-M3 as the default model and assert that M3, M2.7, and M2.7-highspeed all resolve through @ai-sdk/openai-compatible.

The auto-generated model-provider-registry.generated.ts and model-provider-types.generated.ts are intentionally left alone — the existing EXTRA_PROVIDER_REGISTRY overrides take care of the runtime registration regardless of which models models.dev currently lists, so this PR only touches the user-facing docs and tests.

Test plan

• pnpm vitest run src/registries/model-provider-registry-minimax.spec.ts passes (8/8) inside packages/core.
• npx biome check clean on the modified spec file.
• npx prettier --check clean on the modified markdown after applying prettier --write.

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Summary by cubic

Make MiniMax-M3 the default model for minimax and minimax-cn, update quickstart samples and provider tests, and remove M2.5/M2.1/M2 from docs while keeping M2.7 and M2.7-highspeed as previous-gen options. Tests confirm M3, M2.7, and M2.7-highspeed resolve via @ai-sdk/openai-compatible; no runtime registry changes.

• Bug Fixes
  • Corrected MiniMax context windows in docs: M3 = 512K, M2.7/M2.7-highspeed = 192K.

^{Written for commit 3b11827. Summary will update on new commits.}

Summary by CodeRabbit

• New Features

  • Added support for the MiniMax-M3 model and made M3 the default MiniMax model.

• Documentation

  • Updated MiniMax and MiniMax (China) docs and examples to show MiniMax-M3 as default and refreshed the supported models table; older variants (M2.5, M2.1, M2) removed from public docs.

[changeset-bot]

🦋 Changeset detected

Latest commit: 3fa3c24

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@voltagent/core	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR updates the MiniMax provider default from MiniMax-M2.7 to MiniMax-M3 across tests, provider documentation (standard and China), and a changeset entry; supported model lists are reduced to MiniMax-M3, MiniMax-M2.7, and MiniMax-M2.7-highspeed.

Changes

MiniMax-M3 Default Model Update

Layer / File(s)	Summary
Release notes for MiniMax-M3 addition .changeset/MiniMax-m3-update.md	Changeset entry documents the @voltagent/core patch release adding MiniMax-M3 and switching the default model.
Registry test updates for MiniMax-M3 default packages/core/src/registries/model-provider-registry-minimax.spec.ts	Registry tests now resolve minimax to MiniMax-M3 in basic loading, China provider, MINIMAX_BASE_URL override, and missing MINIMAX_API_KEY failure; tested variant list changed to MiniMax-M3, MiniMax-M2.7, and MiniMax-M2.7-highspeed.
Provider documentation updates for MiniMax-M3 website/models-docs/providers/minimax-cn.md, website/models-docs/providers/minimax.md	Quick-start examples now use minimax-cn/MiniMax-M3 and minimax/MiniMax-M3; model tables trimmed to MiniMax-M3, MiniMax-M2.7, and MiniMax-M2.7-highspeed.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• VoltAgent/voltagent#1167: Related updates to MiniMax provider tests and documentation concerning MiniMax model-resolution and defaults.

Poem

🐰 A little rabbit hops with glee,
M3 now leads the MiniMax marquee,
Tests and docs in tidy rows,
A gentle change the garden knows.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The PR title directly reflects the main changes: adding MiniMax-M3 documentation and updating the minimax default model across all modified files.
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.
Description check	✅ Passed	The pull request description is comprehensive and follows the template structure with clear sections covering current behavior, new behavior, testing details, and implementation notes.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[cubic-dev-ai]

No issues found across 4 files

_{Re-trigger cubic}