* docs: add OpenAI-compatible API limitations for Anthropic thinking
Document the fundamental incompatibility between Anthropic extended
thinking and OpenAI-compatible API clients. Explains:
- Why thinking_blocks must be resent (stateless vs stateful APIs)
- OpenAI vs Anthropic architecture differences
- Solutions for client developers
* Update docs
* fix: auto-drop thinking param when thinking_blocks missing
When modify_params=True, LiteLLM now automatically drops the 'thinking'
param if the last assistant message with tool_calls is missing
thinking_blocks. This prevents the Anthropic error:
"Expected thinking or redacted_thinking, but found tool_use"
This workaround addresses the OpenAI-Anthropic API incompatibility where
OpenAI-compatible clients don't preserve thinking_blocks.
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