Fix permission denied error by saving temp files to /tmp

Refactor to fast Embedding and Docx-to-PDF APIs for Vercel consumption

Update app/chains/processing_chain.py

Update app/nodes/enhancer.py

Update app/nodes/segmenter.py

Update app/nodes/frame_extractor.py

Update app/utils/video_utils.py

Update Dockerfile

Update requirements.txt

Update app/main.py

Update app/chains/processing_chain.py

Update app/utils/video_utils.py

Update app/models.py

Update app/chains/processing_chain.py

Update app/main.py

Update app/chains/processing_chain.py

Update app/main.py

Update Dockerfile

Update Dockerfile

Update app/main.py

Update app/main.py

Update Dockerfile

Update app/main.py

Update app/chains/processing_chain.py

Update app/models.py

Update Dockerfile

Update app/main.py

Update app/chains/processing_chain.py

Update app/nodes/enhancer.py

Update app/nodes/segmenter.py

Update app/nodes/frame_extractor.py

Update app/utils/video_utils.py

Update app/models.py

Update requirements.txt

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