feat(minimax): add LLM support with MiniMax-M3 model

[sfsfco]

Description

Add LLM support to the MiniMax plugin, enabling MiniMax-M3 model for chat completions in LiveKit Agents.

Changes Made

• Added src/llm.ts with LLM and LLMStream classes extending the framework's LLM abstractions.
• Updated src/models.ts with ChatModels type and MiniMax-M3 model.
• Added ChatModels type including MiniMax-M3, M2.7, M2.5, M2.1.
• Updated src/index.ts to export the new LLM module.
• Added axios dependency for HTTP requests.

Pre-Review Checklist

• Build passes: All builds (lint, typecheck, tests) pass locally
• AI-generated code reviewed: Removed unnecessary comments and ensured code quality
• Changes explained: All changes are properly documented and justified above
• Scope appropriate: All changes relate to the PR title, or explanations provided for why they're included

Testing

• Automated tests added/updated (if applicable)
• All tests pass

Additional Notes

• MiniMax-M3 is the default model, with M2.7, M2.7-highspeed, M2.5, M2.1 also supported.
• Requires MINIMAX_API_KEY environment variable.
• Based on the existing TTS implementation patterns in this plugin.

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Latest commit: 020a097

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