fix: resolve Anthropic Bedrock model IDs

[C1-BA-B1-F3]

Summary

• normalize Anthropic Bedrock provider and cross-region model IDs before model-info lookup
• strip Bedrock version suffixes such as -v1:0 so existing Claude table entries are reused
• add no-network regression tests for get_info and get_token_limit

Fixes #7833

Testing

• .venv/bin/python -m pytest python/packages/autogen-ext/tests/models/test_anthropic_model_info.py
• .venv/bin/ruff check python/packages/autogen-ext/src/autogen_ext/models/anthropic/_model_info.py python/packages/autogen-ext/tests/models/test_anthropic_model_info.py

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