feat(genai): add configurable base_url for OpenAI API integration

[skrashevich]

PR Description: Add Configurable base_url for OpenAI API Integration

Overview

This pull request introduces a new feature that enhances the integration with the OpenAI API by allowing the base_url to be configurable. This flexibility is particularly useful for scenarios where the default OpenAI API endpoint needs to be changed or for testing against mock servers.

Changes Made

• Configuration Update: Modified the configuration file genai.md to include base_url as a new configurable parameter. The default value is set to https://api.openai.com/v1 .
• Code Enhancements: Updated the OpenAIClient class in frigate/genai/openai.py to support the new base_url configuration parameter:
• If base_url is not provided or is empty, it defaults to https://api.openai.com/v1 .
• The OpenAI client is now initialized with both api_key and base_url .

Benefits

• Increased Flexibility: Users can now specify a different API endpoint if needed, which enhances the adaptability of the integration to different deployment environments or testing needs.
• Backward Compatibility: Existing configurations continue to work without modification, thanks to the default value setting.

Files Changed

• docs/docs/configuration/genai.md : Added documentation for the new base_url configuration option.
• frigate/genai/openai.py : Updated the OpenAI client initialization to incorporate the configurable base_url .

Use Case

Users who wish to utilize an alternative endpoint or a self-hosted proxy for the OpenAI API can now simply adjust the base_url parameter in their configuration settings, making the client versatile for various setups.

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• The code has been formatted using Ruff (ruff format frigate)

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[hawkeye217]

I can't test this directly, but if you've tested it with and without a base_url and it works, I think this can be merged. Please confirm.