feat: add MiniMax model support via OpenAI-compatible API

[JithendraNara]

Summary

Add support for MiniMax models in LangExtract via the OpenAI-compatible API. Closes #417

Changes

• Add MiniMax patterns (MiniMax-M2.5, etc.) to patterns.py
• These work with the existing OpenAI provider since MiniMax offers OpenAI-compatible API

Usage

from langextract.factory import ModelConfig, create_model
import langextract as lx

config = ModelConfig(
    model_id="MiniMax-M2.5",
    provider_kwargs={
        "api_key": "your-minimax-api-key",
        "base_url": "https://api.minimax.io/v1"
    }
)
model = create_model(config)

result = lx.extract(
    text_or_documents=your_text,
    prompt_description=your_instructions,
    model=model
)

Testing

Tested successfully with MiniMax-M2.5 model via OpenAI-compatible API.

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