Fix PyAV dependency for video processing

- Add av>=10.0.0 to requirements.txt and fastapi_requirements.txt
- Resolves torchvision video operations error in HuggingFace Space
- Required for video frame extraction and processing

fastapi_requirements.txt

@@ -7,3 +7,6 @@ python-multipart==0.0.6
 pydantic==2.5.0
 python-jose[cryptography]==3.3.0
 passlib[bcrypt]==1.7.4
+
+# Video processing dependency for torchvision
+av>=10.0.0

requirements.txt

@@ -11,6 +11,7 @@ pillow>=10.0.0
 opencv-python>=4.8.0
 imageio>=2.31.0
 imageio-ffmpeg>=0.4.9
+av>=10.0.0
 
 # Hugging Face Integration
 huggingface-hub>=0.20.0