feat: add MiniMax as first-class LLM provider

[octo-patch]

Summary

Add MiniMax AI as a built-in LLM provider alongside existing providers (OpenAI, Anthropic, Google Gemini, etc.) for both standard and custom provider modes.

Changes

Backend (API + SDK):

• Register MINIMAX in StandardProviderKind and CustomProviderKind enums
• Add MiniMax models to supported_llm_models via LiteLLM native minimax/ prefix routing:
  • minimax/MiniMax-M2.7 (latest flagship, 1M context)
  • minimax/MiniMax-M2.7-highspeed (optimized for speed)
  • minimax/MiniMax-M2.5 (previous generation)
  • minimax/MiniMax-M2.5-lightning (fast previous generation)

Frontend (Web):

• Add MINIMAX to SecretDTOProvider enum, PROVIDER_LABELS, and PROVIDER_KINDS
• Add MINIMAX_API_KEY env var mapping in llmProviders.ts
• Add MiniMax to llmAvailableProviders list for the settings UI
• Add MiniMax SVG icon component and register in LLMIconMap
• Add MiniMax to PROVIDER_ICON_MAP for the provider selector dropdown

Tests:

• 17 unit tests: model registry, provider mapping, enum validation
• 10 integration tests: secret parsing roundtrip, provider normalization, enum consistency

How it works

MiniMax provides an OpenAI-compatible API at https://api.minimax.io/v1. LiteLLM already has native MiniMax provider support, so models are routed via the minimax/ prefix. Users configure MiniMax by adding their MINIMAX_API_KEY in the Agenta secrets vault, just like any other standard provider.

Test plan

• All 27 new tests pass (17 unit + 10 integration)
• Verify MiniMax appears in provider selector dropdown
• Verify adding MINIMAX_API_KEY and selecting a MiniMax model works in Playground
• Verify existing providers are unaffected

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[mmabrouk]

Hey @octo-patch

Thank you for your contribution!

1. Please use the PR template for your PR
2. Please check the contributing guidelines https://agenta.ai/docs/contributing/first-pr we require for instance a short loom video demo for the feature with the PR

Thank you!