Change default API endpoint to models.github.ai/inference and rename COPILOT_API_ENDPOINT to AI_API_ENDPOINT

[Copilot]

The default endpoint https://api.githubcopilot.com doesn't work with PAT authentication. Changed default to https://models.github.ai/inference and renamed the environment variable to the more generic AI_API_ENDPOINT.

Changes

• src/seclab_taskflow_agent/capi.py: Renamed COPILOT_API_ENDPOINT → AI_API_ENDPOINT, changed default from api.githubcopilot.com to models.github.ai/inference
• src/seclab_taskflow_agent/agent.py: Updated imports and references
• tests/test_yaml_parser.py: Added test coverage for endpoint configuration and environment variable override

Usage

# Default (models.github.ai/inference)
from seclab_taskflow_agent.capi import AI_API_ENDPOINT

# Override via environment
AI_API_ENDPOINT=https://api.githubcopilot.com python -m seclab_taskflow_agent

Both endpoints remain fully supported via the environment variable.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Change the default API endpoint</issue_title>
<issue_description>Change it to https://models.github.ai/inference. (It is currently set to https://api.githubcopilot.com, which doesn't work with a PAT.)
Also rename COPILOT_API_ENDPOINT to something more generic like AI_API_ENDPOINT.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Change the default API endpoint #93

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