feat: Set gpt-oss:120b as default model for Ollama

[timothyba]

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[Copilot]

Pull Request Overview

This pull request sets "gpt-oss:120b" as the default model for Ollama language model usage. The change introduces default model selection logic that automatically chooses appropriate models based on the language model type when no model ID is explicitly provided.

• Updates the Ollama language model constructor to use "gpt-oss:120b" as the default model
• Modifies the main extract function to accept None for model_id and implement automatic model selection
• Adds logic to set default models for different language model types (Ollama, Gemini, OpenAI)

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
langextract/inference.py	Sets default model_id parameter to "gpt-oss:120b" for OllamaLanguageModel constructor
langextract/init.py	Changes model_id parameter to optional and adds default model selection logic based on language_model_type

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