Embed openai broad multimodal compat

[michaelfeil]

Closes #394

[greptile-apps]

PR Summary

This pull request introduces significant changes to support multimodal embeddings (text, image, and audio) through a unified /embeddings endpoint in the Infinity API.

• Deprecated separate /embeddings_image and /embeddings_audio endpoints in favor of the unified /embeddings endpoint with infinity_extra_modality parameter
• Added new OpenAIEmbeddingInputAudio, OpenAIEmbeddingInputImage, and OpenAIEmbeddingInputText models in libs/client_infinity/infinity_client/infinity_client/models/
• Updated infinity_server.py to handle multimodal inputs and improve error handling
• Introduced comprehensive tests in test_openapi_client_compat.py for OpenAI-compatible embedding API across all modalities
• Updated OpenAPI specification in docs/assets/openapi.json to reflect new multimodal embedding capabilities

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Codecov Report

Attention: Patch coverage is 77.04918% with 14 lines in your changes missing coverage. Please review.

Project coverage is 78.55%. Comparing base (3de8ea7) to head (a23810b).

Files with missing lines	Patch %	Lines
...inity_emb/infinity_emb/fastapi_schemas/pymodels.py	68.96%	9 Missing ⚠️
libs/infinity_emb/infinity_emb/infinity_server.py	88.46%	3 Missing ⚠️
...finity_emb/infinity_emb/transformer/audio/utils.py	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #395      +/-   ##
==========================================
- Coverage   78.67%   78.55%   -0.12%     
==========================================
  Files          39       39              
  Lines        2963     3008      +45     
==========================================
+ Hits         2331     2363      +32     
- Misses        632      645      +13     

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