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fix: support GPT-5 and reasoning models with MaxCompletionTokens (#333)

OpenAI API changed requirements for GPT-5 and reasoning models (o1, o3, o4).
These models now require max_completion_tokens parameter instead of the
deprecated max_tokens parameter.

Added isReasoningModel() method to detect models requiring the new parameter.
The method checks for o1/o3/o4 prefixes and gpt-5 in model name.

Changes:
- add isReasoningModel() helper to detect reasoning/GPT-5 models
- use MaxCompletionTokens for reasoning models, MaxTokens for standard models
- add comprehensive tests for model detection and parameter usage
- verified against real OpenAI API with gpt-4o-mini and gpt-5-mini

Related to #332

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