chore: Update Dockerfile and requirements.txt for Huggingface Spaces deployment

Refactor code to use shared BaseModel for Painting and InpaintingRequest classes

chore: Include batch_painting router in product diffusion API

chore: Update Inpainting model name in config.py

chore: Update import statement for InpaintingRequest in painting.py and refactor code to use shared BaseModel for Painting and InpaintingRequest classes

added API folder