chore: update models in model configs

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[Copilot]

Pull request overview

Updates model configuration files to point to newer model versions (gpt-5.4, claude-sonnet-4.6), switches to the responses API type, and consolidates by removing the codeql_python-specific config in favor of the shared model_config.

Changes:

• Bump model versions and add api_type: responses settings in model_config.yaml and model_config_lowercost.yaml.
• Delete model_config_codeql_python.yaml and update the audit taskflow to reference the generic model_config instead.

Show a summary per file

File	Description
src/seclab_taskflows/configs/model_config.yaml	Updates models to gpt-5.4 / claude-sonnet-4.6 and replaces temperature with api_type: responses for code_analysis and general_tasks.
src/seclab_taskflows/configs/model_config_lowercost.yaml	Updates to gpt-5.4-mini and adds api_type: responses settings.
src/seclab_taskflows/configs/model_config_codeql_python.yaml	Deletes the codeql_python-specific model config.
src/seclab_taskflows/taskflows/audit/remote_sources_local.yaml	Switches the audit taskflow to use the generic model_config after the codeql_python config removal.

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• Files reviewed: 4/4 changed files
• Comments generated: 0