fix(openai-video): inherit BaseVideoConfig to enable async content response

[pnookala-godaddy]

Title

fix(openai-video): inherit BaseVideoConfig to enable async content response

Relevant issues

• Resolves AttributeError when calling avideo_content for OpenAI:
  • "'OpenAIVideoConfig' object has no attribute 'async_transform_video_content_response'"

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🐛 Bug Fix

Changes

• Import and subclass the real base class at runtime in OpenAIVideoConfig:
  • from litellm.llms.base_llm.videos.transformation import BaseVideoConfig
  • class OpenAIVideoConfig(BaseVideoConfig):
• Remove TYPE_CHECKING aliasing of BaseVideoConfig to Any so the class inherits:
  • async_transform_video_content_response(...) default implementation
• Scope: OpenAI videos only; no API changes; no behavior changes beyond fixing the AttributeError during async content downloads.

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