Add MiniMax provider to model resolver and debugging agent

[octo-patch]

Reason: provider-add — Libretto's executable model resolver and browser-debugging agent omitted MiniMax.

What changed

Add the MiniMax provider to both model-resolution entry points, using MiniMax's OpenAI-compatible and Anthropic-compatible endpoints with global and China hosts. MiniMax model ids (for example MiniMax-M3) are passed straight through as provider/model-id — no model names are hardcoded.

• packages/libretto/src/cli/core/resolve-model.ts

  • Provider type gains "minimax"; SUPPORTED_PROVIDER_ALIASES accepts minimax.
  • parseModel lists MiniMax in the supported-providers error message.
  • hasProviderCredentials checks MINIMAX_API_KEY; missingProviderCredentialsMessage returns a MiniMax-specific message.
  • getProviderModel resolves MiniMax through @ai-sdk/openai against ${host}/v1 by default, or @ai-sdk/anthropic against ${host}/anthropic when MINIMAX_API_STYLE=anthropic. The host is the global api.minimax.io unless MINIMAX_REGION is set to a China value (cn / cn_zh / china), in which case it uses api.minimaxi.com.

• packages/playwright-debugger/src/index.ts

  • SupportedAgentProvider gains "minimax"; parseAgentModel accepts it and lists it in the supported-providers error.
  • resolveLanguageModel resolves a MiniMax model through createOpenAI (${host}/v1) by default, or createAnthropic (${host}/anthropic) when MINIMAX_API_STYLE=anthropic, with the same global/China host selection and the same agent.apiKey override convention as the existing OpenAI/Anthropic branches.

• packages/playwright-debugger/test/debugger.spec.ts

  • parseAgentModel now parses minimax/MiniMax-M3 to { provider: "minimax", modelId: "MiniMax-M3" }.

• docs/reference/runtime/playwright-debugger.mdx

  • Lists MiniMax as a supported provider, documents MINIMAX_API_STYLE and MINIMAX_REGION, and adds MINIMAX_API_KEY to the model-keys example.

Checks

• packages/playwright-debugger: tsc --noEmit (type-check) passed; vitest run test/debugger.spec.ts passed (9 tests).
• packages/libretto: tsc --noEmit (type-check) passed; vitest run test/ai-config.spec.ts test/credentials.spec.ts passed (9 tests).
• oxlint --type-aware on the changed source files passed.

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