Copy cached chat completion results

[ump45nose]

Summary

Cache hits now return a copied CreateResult marked as cached instead of mutating the cached instance.

Root cause

ChatCompletionCache changed cached_result.cached in place, which also changed the object returned by the original cache-miss call.

Validation

• uv run --directory python --with pytest-asyncio --package autogen-ext pytest packages/autogen-ext/tests/models/test_chat_completion_cache.py -q
• uv run --directory python --with ruff --package autogen-ext ruff check packages/autogen-ext/src/autogen_ext/models/cache/_chat_completion_cache.py packages/autogen-ext/tests/models/test_chat_completion_cache.py

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