feat(model/minimax): add MiniMax ChatModel provider

[octo-patch]

Summary

Add MiniMax as a new ChatModel provider for the Eino framework.

MiniMax provides OpenAI-compatible API endpoints, making integration clean and straightforward using the existing libs/acl/openai client.

Supported Models

Model	Description
MiniMax-M2.7	Peak Performance. Ultimate Value. Master the Complex. (default)
MiniMax-M2.7-highspeed	Same performance, faster and more agile

Both models support 204,800 tokens context window and up to 192K output tokens.

Features

• Chat completion (Generate) and streaming (Stream)
• Tool calling / Function calling via ToolCallingChatModel interface
• Temperature auto-clamping to MiniMax's valid range (0.0, 1.0]
• Callback integration for observability
• Configurable base URL (global: api.minimax.io, China: api.minimaxi.com)

Files Added (8 files, ~1143 additions)

components/model/minimax/
├── chatmodel.go                  # Main provider implementation
├── chatmodel_test.go             # Unit tests (13 test cases)
├── chatmodel_integration_test.go # Integration tests (3 test cases, build tag: integration)
├── option.go                     # Provider-specific options
├── go.mod / go.sum               # Dependencies
├── README.md                     # English documentation
└── README_zh.md                  # Chinese documentation

Test Plan

• Unit tests pass (13 test cases covering config validation, temperature clamping, Generate, Stream, WithTools, error handling)
• Integration tests pass against real MiniMax API (Generate, Stream, highspeed model)
• go mod tidy succeeds
• Code follows existing provider patterns (OpenAI, OpenRouter)

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✅ tangchaojun-bytedance
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[tangchaojun-bytedance]

@octo-patch hello, thanks for your pr. please check CI results and solve them.