Migrate AzureOpenAI constructors to OpenAI client

[Copilot]

This PR migrates the repository from deprecated AzureOpenAI constructors to the standard OpenAI client constructors to maintain compatibility with current OpenAI SDK versions.

Changes Made

Updated example.py

Replaced the deprecated constructor pattern:

# Before
client = openai.AzureOpenAI(
    api_version="2024-03-01-preview",
    azure_endpoint=f"https://{os.getenv('AZURE_OPENAI_SERVICE')}.openai.azure.com",
    azure_ad_token_provider=token_provider,
)

# After
client = openai.OpenAI(
    base_url=f"https://{os.getenv('AZURE_OPENAI_SERVICE')}.openai.azure.com/openai/v1",
    api_key=token_provider,
)

Key parameter mappings:

• AzureOpenAI → OpenAI
• azure_endpoint → base_url (with /openai/v1 API path)
• azure_ad_token_provider → api_key
• Removed api_version parameter (no longer needed)

Updated requirements.txt

Changed the OpenAI dependency from openai to openai>=1.108.1 to ensure compatibility with the new constructor pattern.

Why This Change

The AzureOpenAI and AsyncAzureOpenAI constructors are deprecated in recent OpenAI SDK versions. The standard OpenAI / AsyncOpenAI constructors now fully support Azure OpenAI endpoints and provide the same functionality while maintaining forward compatibility.

This change ensures the repository works with OpenAI SDK versions 1.108.1 and later, which is the first version where the standard constructors fully replace the Azure-specific ones.

Fixes #31.

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[pamelafox]

@copilot Add "/openai/v1" to the endpoint URL

[Copilot]

Added /openai/v1 to the endpoint URL. The base_url is now https://{service}.openai.azure.com/openai/v1 for proper Azure OpenAI API access. (4934118)

[pamelafox]

See comment

[madebygps]

lgtm