auto get modality

[lloydzhou]

Related Issue

Checklist

• I have read the CONTRIBUTING guidelines.
• I have added tests to cover my changes.
• I have updated the documentation (docs folder) accordingly.

Additional Notes

Add any other context about the PR here.

[greptile-apps]

PR Summary

This PR enhances the get_modality function to automatically detect content type (text, image, or audio) based on input patterns rather than requiring explicit modality specification.

• Modified get_modality in libs/infinity_emb/infinity_emb/fastapi_schemas/pymodels.py to examine URL patterns, file extensions, and data URI prefixes
• Added pattern recognition for common image formats (jpg, jpeg, png, etc.) and audio formats (mp3, wav, etc.)
• Implemented fallback to explicit modality parameter when available
• Improved user experience by reducing the need for manual modality specification
• This change supports the integration of models like nomic-ai/nomic-embed-text-v1.5 mentioned in issue #123

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[michaelfeil]

I am worried that this, combined with a check takes a hit on performance.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 50.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 79.69%. Comparing base (88bad14) to head (075dad6).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...inity_emb/infinity_emb/fastapi_schemas/pymodels.py	50.00%	9 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #567      +/-   ##
==========================================
- Coverage   79.85%   79.69%   -0.16%     
==========================================
  Files          43       43              
  Lines        3489     3506      +17     
==========================================
+ Hits         2786     2794       +8     
- Misses        703      712       +9     

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