Migrate AzureOpenAI constructors to OpenAI client

Issue Description

This repository is using the Azure-specific client constructors from the OpenAI SDK:
AzureOpenAI or AsyncAzureOpenAI.

These constructors are deprecated in the latest SDKs. Migrate to the standard
OpenAI / AsyncOpenAI constructors instead so the code stays compatible with the
current API surface.

Required Updates

1. Replace constructors

   # Before
   client = openai.AzureOpenAI(
       api_version=os.environ["AZURE_OPENAI_VERSION"],
       azure_endpoint=os.environ["AZURE_OPENAI_ENDPOINT"],
       azure_ad_token_provider=token_provider,
   )
   
   # After
   client = openai.OpenAI(
       base_url=os.environ["AZURE_OPENAI_ENDPOINT"],
       api_key=token_provider,
   )
   

   • AzureOpenAI → OpenAI (or AsyncAzureOpenAI → AsyncOpenAI).
   • azure_endpoint → base_url.
   • azure_ad_token_provider (or similar Azure credential helpers) → api_key.

2. Remove api_version usage

   • Delete the api_version=... argument from client construction.
   • Remove any AZURE_OPENAI_VERSION environment variables and references (including
     .env, application settings, and infra/main.bicep or other Bicep files).

3. Update package requirements

   • Ensure requirements.txt or pyproject.toml declares openai>=1.108.1.
     This is the first version where OpenAI / AsyncOpenAI fully replace the
     Azure-specific constructors.

Follow-up Checklist

• All Python client instantiations use OpenAI / AsyncOpenAI.
• No api_version argument or related environment variables remain.
• Dependency metadata requires openai>=1.108.1.

Addressing these items will keep the repository aligned with the supported OpenAI SDK usage.

Details

Pattern: \b(?:AzureOpenAI|AsyncAzureOpenAI)\s*\(

Found matches in 2 file(s) with 6 total match(es):

File: evals/generate_ground_truth.py

• Line 88: openai_client = AzureOpenAI(

• Line 97: openai_client = AzureOpenAI(

File: src/backend/fastapi_app/openai_clients.py

• Line 26: openai_chat_client = openai.AsyncAzureOpenAI(

• Line 41: openai_chat_client = openai.AsyncAzureOpenAI(

• Line 85: openai_embed_client = openai.AsyncAzureOpenAI(

• Line 100: openai_embed_client = openai.AsyncAzureOpenAI(

Repository: https://github.com/Azure-Samples/rag-postgres-openai-python

This issue was automatically created by the GitHub Repo Maintainer Agent.