Add MiniMax hosted inference adapter

[octo-patch]

What does this PR do?

Adds a MiniMax hosted inference adapter with complete model and endpoint coverage.

Summary

• Support MiniMax-M3 and MiniMax-M2.7.
• Support global and China endpoints through OpenAI- and Anthropic-compatible API formats.
• Document all four endpoint configurations and add request-capture tests for their final request paths.

Feature/Issue validation/testing

• PYTHONPATH=src python src/tests/test_llm.py -v
• python -m black --target-version py38 --check src/tests/test_llm.py
• python -m black --target-version py38 --line-ranges 163-230 --check src/llama_cookbook/inference/llm.py
• python -m py_compile src/llama_cookbook/inference/llm.py src/tests/test_llm.py
• python -m pip check
• git diff --check

Before submitting

• Read the contributor guidelines.
• Updated the documentation.
• Added focused tests for the new adapter.

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